OAuth is an open standard for access delegation, commonly used to grant websites or applications limited access to a user's resources on another service without exposing the user's credentials. OAuth 2.0, the current version, defines flows for web apps, mobile apps, and server-to-server communication using access tokens and refresh tokens.
OAuth powers the 'Sign in with Google/GitHub/Facebook' buttons you see everywhere. It is the standard for secure, delegated authorization on the web. Without OAuth, users would need to share their passwords with every third-party app. Understanding OAuth is essential for building secure authentication flows in modern applications.
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