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Difference between OpenID Connect and OAuth 2.0

OpenID Connect OAuth 2.0
OpenID Connect is a "profile" of OAuth 2.0 specifically designed for attribute release and authentication.OAuth 2.0 is an authorization framework, not an authentication protocol. OAuth 2.0 can be used for a lot of cool tasks, one of which is person authentication. This has been designed mainly for autornization.
There is id_token defiend as part of authentication.There is no id_token defined in OAuth 2.0 because it is specific to federated authentication.
OpenID Connect is laser-focused on user authentication.OAuth 2.0 was left generic so it could be applied to many authorization requirements, like API access management, posting on someone’s wall, and using IOT services.

Related differences

OpenID Connect vs OAuth 2.0SAML vs OpenID Connect
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