Roblox is an online gaming platform and game creation system that allows users to create and play games created by other users. It offers a vast virtual world where players can interact, socialize, and play games created by the Roblox community. The platform provides a wide range of game genres, from adventure and simulation to role-playing and obstacle courses. Players can customize their avatars, design their own games, and even monetize their creations. Roblox is popular among players of all ages due to its creative freedom and diverse gaming experiences.