OpenID is an open, decentralized, free framework for user-centric
digital identity. OpenID starts with the concept that anyone can identify themselves
on the Internet the same way websites do-with a URI
(also called a URL or web address). Since URIs are at the very core of
Web architecture, they provide a solid foundation for user-centric
identity.
To login to an OpenID-enabled website (even one you've never been
to before), just type your OpenID URI. The website will then redirect
you to your OpenID Provider to login using whatever credentials it
requires. Once authenticated, your OpenID provider will send you back
to the website with the necessary credentials to log you in.
If you want a OpenID indentity, you can select one of this list: Public OpenID Providers
More information about OpenID in this website: OpenID.net
WIKI
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