Token

In computing, a token is a small piece of data that is often used for authentication, security, or access control. Instead of requiring you to repeatedly enter your username and password for each action you want to perform, systems use tokens to verify your identity. After you log in, the server generates a token, which grants access to resources for a certain period or until it expires.

One of the most common types of tokens is the JSON Web Token (JWT). It’s secure and easy to pass between a client and server. The token contains key information, like the user’s ID and permissions, which the server checks with each request. So, each time you log in, you don’t need to re-enter your credentials.

A great feature is that all the information is embedded within the token itself, rather than stored on the server. This reduces server load and makes the system more scalable.

Additionally, tokens help to secure API calls in apps and websites. They give temporary access, so that the communication between clients and servers stays secure, without exposing sensitive details.