Auth0 is a cloud-based platform that provides authentication and authorization services for applications. It allows developers to easily implement secure login systems, enabling users to access applications using various methods, such as email, social media accounts, or single sign-on (SSO). This helps streamline the user experience while ensuring that sensitive data remains protected. With Auth0, businesses can manage user identities and permissions efficiently. The platform offers features like multi-factor authentication (MFA) and user management dashboards, making it easier for organizations to comply with security regulations. Overall, Auth0 simplifies the process of securing applications and managing user access.