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OAuth

OAuth is an open standard for access delegation, commonly used as a way for Internet users to grant websites or applications access to their information on other websites but without giving them the passwords. This mechanism is used by companies such as Amazon, Google, Facebook, Microsoft, Twitter, etc. to permit the users to share information about their accounts with third party applications or websites.

Generally, OAuth provides to clients a “secure delegated access” to server resources on behalf of a resource owner. It specifies a process for resource owners to authorise third-party access to their server resources without sharing their credentials. Designed specifically to work with Hypertext Transfer Protocol (HTTP), OAuth essentially allows access tokens to be issued to third-party clients by an authorisation server, with the approval of the resource owner. The third party then uses the access token to access the protected resources hosted by the resource server.

OAuth is distinct from OATH, which is a reference architecture for authentication, not a standard for authorisation.