Open Standard Authorization ( OAuth )

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Open Standard Authorization ( OAUTH ) is an authorization protocol - or in other words, a set of rules - that allows a third-party website or application to access a user’s data without the user needing to share login credentials.

OAuth's open-source protocol enables users to share their data and resources stored on one site with another site under a secure authorization scheme based on a token-based authorization mechanism. OAuth is also known as OAuth Core.

Source: https://www.techopedia.com/definition/26694/oauth