FAQ Q175: What is OpenID?
OpenID is a technology that allows you to log into new websites (such as Planyo) using your existing login/password from a different website. The advantage is that you don't have to remember lots of login/password pairs for each website you want to use. Another advantage is that the registration process is much shorter, there is no email verification step if you use the OpenID login in Planyo.
Most likely you already have at least one OpenID account. Your Google, Yahoo, AOL accounts (as well as many more) can be used for OpenID login in Planyo.
You can find out more about OpenID at OpenID.net