At a high level , this short video discusses when an application should use OAuth 2.x and when it should use OpenID Connect. The video discusses the use cases for both by giving a specific example of an application and a few good diagrams. It discusses the use of Google and Facebook Authorization Servers in these scenarios. Check out my other links below for discounted popular courses ( $ or best local price) My Website : OAuth & OpenID Connect : Advanced OpenID Connect : SAML : My Blog : @viraj_63415