OAuth is not an API or a service: it is an open standard for authorization and any developer can implement it. OAuth is a standard that applications can use to provide client applications with “secure delegated access”. OAuth works over HTTP and authorizes Devices, APIs, Servers and Applications with access tokens rather than credentials, which we will go over in depth below. OpenID Connect (OIDC) is built on top of the OAuth 2.0 protocol. It allows clients to verify the identity of the user and, as well as to obtain their basic profile information. This session covers how OAuth/OIDC works, when to use them, and frameworks/services that simplify authentication.