Industry-standard authorization framework for secure API access
OAuth 2.0 is the authorization framework that powers "Sign in with Google/GitHub/Facebook" and secures API access across the modern web. Understanding OAuth flows (Authorization Code, Client Credentials, PKCE) is essential for building secure applications that integrate with third-party services. Combined with OpenID Connect (OIDC) for authentication, OAuth 2.0 forms the foundation of modern identity and access management.