What is OAuth and how it works?

OAuth (Open Authorization) is an open standard for authorization that allows users to grant third-party access to their resources without sharing their passwords. It is commonly used to grant access to APIs (Application Programming Interfaces) and other web-based resources.

Here is how OAuth works:

1. The user (resource owner) grants access to their resources to a third-party client (such as a website or mobile app).
2. The third-party client sends a request for access to the resource server (such as an API).
3. The resource server sends a response to the client, directing the user to authenticate with the authorization server.
4. The user authenticates with the authorization server, which generates an authorization code.
5. The authorization code is sent back to the client, which exchanges it for an access token.
6. The client uses the access token to request access to the protected resources from the resource server.
7. The resource server grants access to the protected resources to the client, if the access token is valid.

OAuth allows users to grant third-party access to their resources without having to share their passwords, which helps to improve security and protect against unauthorized access. It is widely used by APIs and other web-based resources to enable secure access to protected resources.

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