OpenID is a shared identity service which allows Internet users to log on to many web sites using a single sign-on or in other words a single username or user ID, thus eliminating the need for a different user name and password for each site.
An OpenID is in the form of a link or a URL. This URL can be the domain name of your own website, or the URL of an OpenID identity provider. When you log in with an OpenID, you have to log in to the Open identity provider for validation.
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