Which Security Feature does Stateless Authentication and Authorization use for REST API Calls?

Stateless authentication and authorization for REST API calls typically use JSON Web Tokens (JWTs). In this approach, authentication information is embedded in a token that is included in API requests. The token is self-contained, meaning it carries all the necessary information about the user or session, without requiring server-side session storage. When a client makes a request, it sends the JWT, usually in the Authorization header. The server validates the token's signature and extracts the user information to authorize the request. This method ensures that each request is independently verified and reduces the need for server-side session management, enhancing scalability and performance.