What's OpenId
OpenID is a decentralized single sign-on system. Using OpenID-enabled sites, web users do not need to remember traditional authentication tokens such as username and password. Instead, they only need to be previously registered on a website with an OpenID "identity provider", sometimes called an i-broker. Since OpenID is decentralized, any website can employ OpenID software as a way for users to sign in; OpenID solves the problem without relying on any centralized website to confirm digital identity.
Why OpenId
One login, many sites An OpenID is a single username and password that lets you login to any OpenID-enabled site.
It's an open standard OpenID is a protocol made for the public, by the public. No one owns or controls your login information: You do.
Using your own url
You can use your own URL as your OpenID, and still use OpenId.35.com as your OpenID server. To set this up, create an account, and add the following markup into your page's head section:
<link rel="openid.server" href="http://openid.35.com/server" />
<link rel="openid.delegate" href="http://yourname.openid.35.com/" />
That's it. You can now use your own URL to log into OpenID enabled sites with OpenId.35.com as your OpenID server.