Tokens can be used to identify, authenticate, or authorize various actions, transactions, or interactions within a system. They can be thought of as a digital "key" or "credential" that unlocks access to a particular resource, service, or functionality.

Tokens can take many forms, such as:

1. Authentication tokens: used to verify the identity of a user or device.
2. Authorization tokens: used to grant or deny access to specific resources or actions.
3. Session tokens: used to track the state of a user's session or interaction with a system.
4. API tokens: used to authenticate and authorize API requests.