JWT (JSON Web Tokens)

JSON Web Tokens (JWT) are a way to securely transmit information between parties as a compact, URL-safe string. They consist of three parts: a header, a payload, and a signature. The header defines how the token is encoded, the payload contains the information (like user data), and the signature ensures that the token hasn't been tampered with. JWTs are commonly used for authentication: after logging in, a user receives a token, which they can use to access protected resources without needing to log in again. This makes web applications more efficient and secure.