SuperTokens is an open-source user authentication solution designed to simplify the process of implementing secure and scalable authentication systems in web and mobile applications. It provides authentication features such as login, sign-up, passwordless login, social login, and session management. SuperTokens aims to enhance security while reducing the complexity of integrating authentication services into applications. Developers can host SuperTokens themselves or use their managed cloud offering. The platform supports various tech stacks and frameworks, offering easy integration and flexibility for developers.