Django provides a built-in authentication system that manages user authentication, authorization, and session management. It includes a User model that handles user-related data such as usernames, passwords, email addresses, and permissions. Authentication is handled using Django’s authenticate() function, which verifies user credentials, and login() and logout() functions, which manage user sessions. Django also provides a middleware for session handling and an authentication backend system that supports multiple authentication methods, including username-password authentication, token-based authentication, and third-party authentication like OAuth. The built-in authentication views, such as LoginView and LogoutView, simplify authentication handling in web applications. Additionally, Django’s permission framework allows fine-grained access control by assigning groups and permissions to users, restricting or granting access to certain views or functionalities. By default, passwords are securely stored using hashing algorithms like PBKDF2, ensuring security. For advanced authentication, Django supports custom user models, API authentication (via Django REST Framework), and social authentication through third-party packages like django-allauth. This comprehensive authentication system makes Django a robust framework for handling user security and access control efficiently.