What happens when you “Sign in with Google”?

I believe when you sign in with Google, the web application running in your browser calls a command to request the Google Sign In page, and includes a “callback URL” as a parameter in that HTTP request.

When successful, that Google page running in your browser calls the callback URL, and includes an authentication token as a parameter in the HTTP request.

Is it used to permit future calls to your Google profile info, like API calls for name, profile picture, etc.?

Or is it stored as an identification token, like a hashed password, in the user database? (If so, do you receive the same token every time you log in with Google from that same app in the future?)

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What happens when you “Sign in with Google”?

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