There are some concepts relating to SSO - single sign on in software applications.
What is OpenID?
OpenID allows you to use an existing account to sign in to multiple websites, without needing to create new passwords.
You may choose to associate information with your OpenID that can be shared with the websites you visit, such as a name or email address. With OpenID, you control how much of that information is shared with the websites you visit.
With OpenID, your password is only given to your identity provider, and that provider then confirms your identity to the websites you visit. Other than your provider, no website ever sees your password, so you don’t need to worry about an unscrupulous or insecure website compromising your identity.
So when talking about OpenID it means we are talking about authentication topics.
So when talking about OpenID it means we are talking about authentication topics.