Definition: The term "OAuth" is a service that allows web applications to authenticate users with their social media accounts, such as Facebook, Twitter, or Google+ (or any other provider), on their behalf without user interaction. It's like having an account on those services and using it for things you're not allowed to do. The definition of "OAuth" is a protocol or service that allows third-party applications to access users' accounts and interact with them through web services, like Facebook Graph API or Google+ OAuth.
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