On: An Illustrated Guide to OAuth and OpenID Connect

[Groxx]

A large part of the confusion is that "OpenID" is, yes, basically just authentication. It's clearly not OAuth.

"OpenID Connect" is basically OAuth though. It even says so on their website: https://openid.net/connect/faq/

>OpenID Connect is an interoperable authentication protocol based on the OAuth 2.0 family of specifications.

They're quite different things, they're just (ab)using the "OpenID" name for brand recognition.