Many applications these days have implemented external authentication on their websites. This enables users to use their existing login credentials of Twitter, Facebook, Hotmail, or any other and register on a website. This type of authentication provides several benefits to the user registering on a website. It facilitates users to use their existing credentials and avoid themselves from going through a lengthy registration process and remembering the credentials they have created.

ASP.NET Core provides a very easy and quick solution to configure external authentication using OAuth 2.0.

OAuth architecture and basic components are explained in the following section: