OAuth is a safe authorization convention, and OAuth2 is the second form of the OAuth protocol. This protocol is called a framework. OAuth2 enables a third-party application to provide limited access to an HTTP service, such as Google, GitHub, or Twitter. This access is either intended for the benefit of the proprietor or to enable the third-party application to get access to the user account. This creates an authorization stream between web and desktop or mobile devices. It has some important roles that control the users' access limitation.