How does OAuth differ from traditional username/password authentication?

OAuth allows third-party authorization whereas traditional does not
OAuth is token-based authentication whereas traditional is credential-based authentication
OAuth provides limited access to user data whereas traditional allows full access to user credentials
OAuth requires redirection to an authentication server whereas traditional does not

OAuth is a protocol that allows third-party applications to obtain limited access to a user's data without exposing their credentials. Unlike traditional username/password authentication, OAuth involves token-based authentication where access tokens are issued to the third-party application.

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