Goal: To allow third-party applications to access user data without exposing the user's credentials.

• User: The owner of the data to be accessed by the third-party application.
• Third-party Application: An application that requires access to the user's data.
• Resource Owner: The entity that owns the user data, such as a social media platform or email provider.
• Authorization Server: The system that grants access to the user data on behalf of the user.
• Resource Server: The system that stores and manages the user data.

• User has an account with the Resource Owner.
• Third-party Application is registered with the Resource Owner and has been authorized by the user.
• Authorization Server and Resource Server are configured to support OAuth 2.0.

• The Third-party Application requests authorization to access the User's data.
• The User is redirected to the Authorization Server's login page. The User enters their login credentials.
• The Authorization Server verifies the User's credentials against the User's account information stored by the Resource Owner.
• The Authorization Server presents the User with a consent screen, which describes the type of data the Third-party Application is requesting access to and the scope of that access.
• If the User approves the request, the Authorization Server issues an access token to the Third-party Application.
• The Third-party Application uses the access token to authenticate with the Resource Server and request access to the User's data.
• The Resource Server validates the access token and grants the Third-party Application access to the User's data.
• The Third-party Application can now access the User's data as authorized by the access token.

• The Third-party Application can access the User's data as authorized by the User during the consent process.
• The User's credentials are never exposed to the Third-party Application, increasing the security of the authentication process.
• The access token has a limited lifespan, so even if it is compromised, it will eventually become invalid.

• If the User denies the request, the Third-party Application cannot access the User's data.
• If the access token is compromised, the Resource Server will deny access to the User's data. The Third-party Application will need to obtain a new access token to regain access.
• If the Authorization Server or Resource Server is unavailable or experiencing technical issues, the User will not be able to grant access to the Third-party Application.