OpenID Connect

An identity layer built on top of the OAuth 2.0 protocol that allows clients to verify end-user identity via an authorization server.

OpenID Connect (OIDC) streamlines authentication by extending OAuth 2.0 with a dedicated ID Token. It provides a standardized way for applications (Relying Parties) to request and receive information about authenticated sessions and end-users. By using JSON Web Tokens (JWT) and RESTful HTTP flows, OIDC supports diverse clients including web-based, mobile, and JavaScript applications. Major providers like Google, Microsoft, and Okta use this protocol to handle billions of identity requests daily, ensuring interoperability across the modern web ecosystem.

https://openid.net/connect/