Initially I had confusion between OAuth and OpenID, so start using our search giant Google to find the solution.
Now I’m clear what is what.
OpenID:
It is only for Identification / Authentication. Here we need to prove oneself to the OpenID providers like who am I.
OAuth:
It is only Authorization; we are authorizing a third party service to access our personal information without providing our password.
Some interesting links:
Link1
Link2
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Thanks. I was confused on this too.