**FastAPI** is a modern web framework that supports security, authentication and authorization. It has built-in support for OAuth2, which is a standard protocol for handling user authentication and authorization using tokens. FastAPI also provides several tools to help you implement security features easily and rapidly.

One of the ways to implement authentication and authorization in FastAPI is to use the password flow with a bearer token. This means that the user sends their username and password to the API, and the API responds with a token that can be used to access protected resources or perform actions.

To use this method, you need to do the following steps:

- Create an instance of OAuth2PasswordBearer with the URL where the user will send their credentials (e.g. tokenUrl="token").
- Create a dependency function that uses the OAuth2PasswordBearer instance to get the token from the request header and verify it.
- Use the dependency function as a parameter in your protected path operations to authorize the user.

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