OAuth2, to be more precise, is a protocol which can be used both for authentication (verifying the user) and authorization (accessing resources on behalf of that user).
Most people in CIAM (customer identity, individuals owing their account instead of representing a company) only interact with OAuth client for authentication. They do not give access of their google account to some THIRD PARTY COMPANY.
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OAuth2, to be more precise, is a protocol which can be used both for authentication (verifying the user) and authorization (accessing resources on behalf of that user).
Most people in CIAM (customer identity, individuals owing their account instead of representing a company) only interact with OAuth client for authentication. They do not give access of their google account to some THIRD PARTY COMPANY.