Deprecated: stripos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /www/wwwroot/zhanqun.com/list.php on line 48
the best 10 online casinos india

the best 10 online casinos india

Online casinos have become increasingly popular among Indians in recent years. With a vast array of options available, choosing the right online casino can be overwhelming. This article aims to provide you with an overview of the top 10 online casinos in India. Table of Contents Introduction Ranking Criteria Top 10 Online Casinos in India Introduction Online gambling has become a significant industry globally, with many countries regulating and licensing online casinos. In India, there is no specific law that prohibits online gaming; however, it falls under a gray area.

  • Starlight Betting Lounge
    new
    Celestial Bet100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Lucky Ace Palace
    Luck&Luxury100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Cash King Palace
    Royal Wins100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Silver Fox Slots
    Elegance+Fun100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Spin Palace Casino
    Win Big Now100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Golden Spin Casino
    Luxury Play100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Lucky Ace Casino
    Luck&Luxury100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Royal Fortune Gaming
    Opulence & Thrills100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Diamond Crown Casino
    Opulence & Fun100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more
  • Jackpot Haven
    Thrills&Wins100% / $1500
    Casino popularity:
    Collecting more data...
    Payment methods
    • Mifinity
    • Google Pay
    • PIX
    • EcoPayz
    • Neteller
    • Apple Pay
    • Visa
    • Sofort
    • Interac
    • Wagering: 35 x (b)
    • Withdrawal time: 1 days
    • Minimum deposit to casino: $30
    • Bonus max bet: $5
    • Established: 2024
    • Free Spins: 200
    • 1st Deposit Bonus:100% / $1500 + 200 Free Spins
    • Bonus code: FRUIT22nd Deposit Bonus:100% / $1500 + 75 Free Spins
    • Bonus code: FRUIT33rd Deposit Bonus:75% / $3000 + 75 Free Spins
    • Bonus code: FRUIT44th Deposit Bonus:50% / $4500 + 200 Free Spins
    • Leading selection of slots
    • VISA casino site
    • HD streaming casino games
    • Newly unveiled casino
    • Signup offer now available
    • Mr. Gamble special bonuses
    Show more

the best 10 online casinos india

Online casinos have become increasingly popular among Indians in recent years. With a vast array of options available, choosing the right online casino can be overwhelming. This article aims to provide you with an overview of the top 10 online casinos in India.

Table of Contents

  1. Introduction
  2. Ranking Criteria
  3. Top 10 Online Casinos in India

Introduction

Online gambling has become a significant industry globally, with many countries regulating and licensing online casinos. In India, there is no specific law that prohibits online gaming; however, it falls under a gray area. Indian players should be aware of the legal implications before engaging in online casino activities.

Ranking Criteria

To create this list, we have considered several factors such as:

  • License: The legitimacy and trustworthiness of an online casino depend on its licensing.
  • Game variety: An ideal online casino should offer a vast collection of games to cater to diverse player preferences.
  • Deposit and withdrawal options: Indian players expect convenient payment methods for easy transactions.
  • Security measures: A secure connection ensures that sensitive information remains protected.
  • Customer support: Reliable and friendly customer service can make or break the user experience.

Top 10 Online Casinos in India

After careful analysis and consideration of these factors, here are our top picks:

1. Betway Casino

Betway is a well-established online casino with an excellent reputation. It offers over 500 games from prominent providers like Microgaming, NetEnt, and Evolution Gaming.

  • License: Licensed by the Malta Gaming Authority (MGA)
  • Games: 500+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

2. 888 Casino

888 is another top-notch online casino with a vast game collection and reliable customer support.

  • License: Licensed by the Gibraltar Regulatory Authority (GRA)
  • Games: 200+ games
  • Payment methods: Visa, Mastercard, PayPal, and more

3. LeoVegas Casino

LeoVegas is a modern online casino with an impressive game library and smooth user interface.

  • License: Licensed by the Malta Gaming Authority (MGA)
  • Games: 1000+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

4. Royal Vegas Casino

Royal Vegas is a reputable online casino with an extensive game collection and enticing promotions.

  • License: Licensed by the Malta Gaming Authority (MGA)
  • Games: 400+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

5. Dafabet Casino

Dafabet is a popular online casino among Indians, with an impressive game collection and user-friendly interface.

  • License: Licensed by the First Cagayan Leisure and Resort Corporation (FCLRC)
  • Games: 300+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

6. Casino Days

Casino Days is a relatively new online casino with an impressive game collection and generous promotions.

  • License: Licensed by the Curacao eGaming Authority (CEGA)
  • Games: 200+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

7. Casino Tropez

Casino Tropez is a well-established online casino with an extensive game collection and reliable customer support.

  • License: Licensed by the Kahnawake Gaming Commission (KGC)
  • Games: 400+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

8. Casino Classic

Casino Classic is a popular online casino among Indians, with an impressive game collection and enticing promotions.

  • License: Licensed by the Kahnawake Gaming Commission (KGC)
  • Games: 200+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

9. Jackpot City Casino

Jackpot City is a reputable online casino with an extensive game collection and generous promotions.

  • License: Licensed by the Malta Gaming Authority (MGA)
  • Games: 400+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

10. Mr. Green Casino

Mr. Green is a modern online casino with an impressive game library and smooth user interface.

  • License: Licensed by the Malta Gaming Authority (MGA)
  • Games: 500+ games
  • Payment methods: Visa, Mastercard, Skrill, and more

mr bet casino login

Mr Bet Casino is a popular online gaming platform that offers a wide range of entertainment options, including slots, table games, and live dealer games. To access these features, users must first log in to their accounts. This guide will walk you through the process of logging in to Mr Bet Casino, ensuring a smooth and secure experience.

Step-by-Step Guide to Mr Bet Casino Login

1. Visit the Mr Bet Casino Website

  • Open your preferred web browser.
  • Enter the URL of Mr Bet Casino in the address bar.
  • Press Enter to load the website.

2. Locate the Login Section

  • Once the website loads, look for the “Login” or “Sign In” button.
  • This is usually located at the top right corner of the homepage.

3. Enter Your Credentials

  • Click on the “Login” button to open the login form.
  • Enter your registered email address and password in the respective fields.
  • Ensure that the information is correct to avoid login issues.

4. Complete the Captcha (if required)

  • Some websites may require you to complete a captcha to verify that you are a human user.
  • Follow the instructions provided to complete the captcha.

5. Click “Login”

  • After entering your credentials and completing the captcha (if applicable), click the “Login” button.
  • You will be redirected to your account dashboard, where you can access all the features and games available on Mr Bet Casino.

Troubleshooting Common Login Issues

1. Forgot Password

  • If you forget your password, click on the “Forgot Password” link on the login page.
  • Follow the instructions to reset your password via email.

2. Account Locked

  • If your account is locked due to multiple failed login attempts, contact Mr Bet Casino customer support for assistance.

3. Incorrect Email or Password

  • Double-check the email address and password you entered.
  • Ensure there are no typos or extra spaces.

Security Tips for Mr Bet Casino Login

  • Use Strong Passwords: Create a strong, unique password that includes a mix of letters, numbers, and special characters.
  • Enable Two-Factor Authentication: If available, enable two-factor authentication for an extra layer of security.
  • Avoid Public Wi-Fi: Use a secure, private network to log in to your account, especially when making transactions.

Logging in to Mr Bet Casino is a straightforward process that ensures you can access your favorite games and features quickly. By following the steps outlined in this guide and adhering to security best practices, you can enjoy a seamless and secure gaming experience.

grand mondial casino india login

Grand Mondial Casino - A Popular Online Gaming Destination in India ## Overview of Grand Mondial Casino India Login Grand Mondial Casino is a well-established online gaming platform that has gained immense popularity among gamers in India. With its user-friendly interface, exciting game selection, and attractive promotions, this casino has become a go-to destination for many players. In this article, we will delve into the world of Grand Mondial Casino, exploring its features, advantages, and what makes it a popular choice among Indian gamblers. ## History and Background Grand Mondial Casino was founded in 2006 by Apollo Entertainment Ltd, a reputable company with a strong presence in the online gaming industry. Over the years, this casino has undergone significant transformations to keep pace with changing market trends and player preferences. Today, Grand Mondial Casino boasts an impressive array of games, ensuring that players have access to an unparalleled entertainment experience. ## Game Selection at Grand Mondial Casino India Login The game selection at Grand Mondial Casino is truly remarkable. Players can enjoy a vast collection of games from various software providers, including Microgaming and NextGen Gaming. Some of the popular games available on this platform include: * Slots (Classic 3-Reel, Video Slots, Progressive Jackpots) * Table Games (Blackjack, Roulette, Baccarat) * Card Games (Poker, Video Poker) * Live Casino Games (Live Roulette, Live Blackjack) ## Features and Benefits of Grand Mondial Casino India Login Grand Mondial Casino offers a host of features and benefits that make it an attractive option for Indian gamers. Some of the key advantages include: * User-Friendly Interface: The casino’s website is designed to be easy on the eyes and simple to navigate, making it accessible to players of all skill levels. * Multi-Language Support: Players can choose from several languages, including Hindi, English, and other local languages, ensuring that everyone feels welcome. * Secure Payment Options: Grand Mondial Casino uses advanced security measures to protect player data, providing a safe and secure payment environment. * Exciting Promotions and Bonuses: The casino offers various promotions and bonuses to reward loyal players and encourage new registrations. ## How to Login to Grand Mondial Casino India Login Logging in to Grand Mondial Casino is a straightforward process that can be completed in just a few steps: 1. Visit the official website of Grand Mondial Casino (https://www.grandmondialcasino.com). 2. Click on the “Join Now” button and fill out the registration form with your basic details. 3. Verify your account using the activation link sent to your email address. 4. Log in to your account using your username and password. ## Safety and Security Measures at Grand Mondial Casino India Login Grand Mondial Casino places a strong emphasis on player safety and security, ensuring that all transactions are conducted securely and discreetly. The casino adheres to strict regulatory standards, maintaining the highest level of transparency and fairness. ## Conclusion In conclusion, Grand Mondial Casino is an excellent choice for Indian gamers seeking an immersive online gaming experience. With its impressive game selection, user-friendly interface, and attractive promotions, this casino has become a popular destination among players in India. If you’re looking to indulge in some exciting gaming action or simply enjoy the thrill of playing your favorite games from the comfort of your home, Grand Mondial Casino is definitely worth exploring. Just remember to always gamble responsibly and within your means.

Casino Days India login

Welcome to Casino Days India, where the thrill of online gambling meets the convenience of modern technology. Whether you’re a seasoned gambler or a newbie looking to try your luck, Casino Days offers a seamless experience with its user-friendly interface and a wide array of games. This guide will walk you through the process of logging into your Casino Days India account, ensuring you can start playing your favorite games in no time.

Step-by-Step Guide to Casino Days India Login

1. Visit the Casino Days India Website

  • Open your preferred web browser.
  • Enter the URL casinodays.com in the address bar.
  • Press Enter to navigate to the Casino Days India homepage.

2. Locate the Login Button

  • Once on the homepage, look for the “Login” button.
  • It is typically located at the top right corner of the screen, next to the “Sign Up” button.

3. Enter Your Credentials

  • Click on the “Login” button to open the login form.
  • You will be prompted to enter your registered email address and password.
  • Ensure that you type your credentials accurately to avoid login issues.

4. Complete the Captcha (if required)

  • Some users may be required to complete a captcha to verify their identity.
  • Follow the on-screen instructions to complete the captcha.

5. Click on the “Login” Button

  • After entering your credentials and completing the captcha (if required), click on the “Login” button.
  • If your credentials are correct, you will be redirected to your Casino Days India account dashboard.

Troubleshooting Common Login Issues

1. Forgot Password

  • If you forget your password, click on the “Forgot Password?” link below the login form.
  • Enter your registered email address and follow the instructions to reset your password.

2. Account Locked

  • If your account is locked due to multiple failed login attempts, contact Casino Days customer support for assistance.
  • Provide them with your account details and any verification information they may require.

3. Incorrect Email or Password

  • Double-check your email address and password for any typos.
  • Ensure that Caps Lock is off if you’re typing a password that is case-sensitive.

Security Tips for Casino Days India Login

  • Use Strong Passwords: Create a strong password that includes a mix of letters, numbers, and special characters.
  • Enable Two-Factor Authentication: If available, enable two-factor authentication for an added layer of security.
  • Avoid Public Wi-Fi: Use a secure, private network to log in to your Casino Days account.
  • Regularly Update Your Password: Change your password periodically to enhance security.

Logging into your Casino Days India account is a straightforward process that ensures you can access your favorite games and enjoy a seamless gambling experience. By following the steps outlined in this guide and adhering to security best practices, you can ensure a safe and enjoyable time at Casino Days India. Happy gaming!

Frequently Questions

What are the best no deposit free spins casinos available in India?

Discover the best no deposit free spins casinos in India at top-rated platforms like LeoVegas, Royal Panda, and 10CRIC. These casinos offer enticing free spins without requiring a deposit, allowing you to explore their game selection risk-free. LeoVegas, known for its user-friendly interface, provides up to 20 free spins on registration. Royal Panda, celebrated for its diverse game library, offers 10 free spins on sign-up. 10CRIC, tailored for Indian players, grants 20 free spins upon registration. These offers are perfect for new players to experience the thrill of online casino games without financial commitment.

What are the top free spin no deposit bonus codes for casinos in India?

Discover the top free spin no deposit bonus codes for casinos in India. Popular platforms like LeoVegas, Royal Panda, and 10CRIC offer enticing promotions. LeoVegas provides up to 20 free spins without a deposit, while Royal Panda offers 10 free spins on Starburst. 10CRIC, known for its cricket-themed games, also gives 20 free spins upon registration. These bonuses let you enjoy slot games risk-free. Always check the terms and conditions for wagering requirements and validity periods. Start your gaming adventure with these no deposit free spins and explore the best of Indian online casinos.

 

What are the best no deposit bonuses available in India?

In India, several online casinos offer enticing no deposit bonuses to attract new players. Some of the best options include LeoVegas, which provides a free ₹80,000 welcome bonus and 20 free spins without requiring a deposit. Another top choice is Royal Panda, offering a ₹10,000 no deposit bonus and 10 free spins. Betway Casino also stands out with a ₹60,000 welcome bonus and 50 free spins. These bonuses allow players to explore the casino's offerings risk-free, making them ideal for beginners. Always read the terms and conditions to understand the wagering requirements and other restrictions.

How can I discover the best online casino in India through Quora?

To find the best online casino in India through Quora, start by searching for relevant topics such as 'best online casinos in India' or 'top Indian online casinos.' Read through the answers provided by users who have experience with online gambling. Look for detailed responses that mention specific casinos, their features, bonuses, and user experiences. Pay attention to answers with high upvotes and comments, as these are often the most reliable. Additionally, consider following Quora users who specialize in online gambling or have a history of providing valuable insights. By engaging with the community and asking targeted questions, you can gather comprehensive information to help you discover the best online casino in India.

What are the top free spin no deposit bonus codes for casinos in India?

Discover the top free spin no deposit bonus codes for casinos in India. Popular platforms like LeoVegas, Royal Panda, and 10CRIC offer enticing promotions. LeoVegas provides up to 20 free spins without a deposit, while Royal Panda offers 10 free spins on Starburst. 10CRIC, known for its cricket-themed games, also gives 20 free spins upon registration. These bonuses let you enjoy slot games risk-free. Always check the terms and conditions for wagering requirements and validity periods. Start your gaming adventure with these no deposit free spins and explore the best of Indian online casinos.