The document discusses OAuth 2.0 and OpenID Connect. It provides an overview of OAuth 2.0's authorization code and implicit grant flows for obtaining an access token to access a secured resource. It also mentions OAuth 2.0 is used for access control in APIs and enterprises. Additionally, it states OpenID Connect is based on and extends OAuth 2.0 to provide identity features. Finally, it suggests these protocols are important for applications, access control, identity, social media, clouds, and the growing API economy.