Have you been to a web site before and found that you have been given an option to log in with something called OpenID? Has it confused you and left you wondering what in the name of hell it is all about?
OpenID is an authentication service that means you can log into various web sites without having to create multiple accounts. It is designed to save lots of time and you having to memorise numerous passwords.
There is an OpenID WordPress Plug-in that you can install on your blog so that people can sign in with their OpenID accounts.
It also includes an OpenID provider, enabling users to login to OpenID-enabled sites using their own personal WordPress account. XRDS-Simple is required for the OpenID Provider and some features of the OpenID Consumer.