Faster and easier to sign up
An OpenID is a way of identifying yourself
no matter which web site you visit.
It's like a driver's license for the entire Internet. But, it's even
more than that because you can (if you want) associate information with
your OpenID like your name and your e-mail address, and then
you choose how much web sites get to see about you. This means that web sites that take advantage of OpenID
won't bother you for the same information over and over again.
Faster and easier to sign in
OpenID also simplifies signing in. With OpenID
you only have to remember one username and one password.
That's because you log into websites with your OpenID, so your OpenID
is the only thing you have to make secure. Now, you might already use
one username and one password online, but OpenID lets you do this
in a secure way. That's because
you only give your password to your OpenID provider,
and then your provider tells the websites you're visiting that you are
who you say you are. No website other than your provider ever sees your
password, so you don't have to worry about an insecure website
compromising your identity.
Remembering all those usernames can really weigh you down!
Source:
OpenID Explained
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