Pinterest is a virtual pinboard. Pinterest allows you to organize and share all the beautiful things you find on the web.get inspiration from people who share your interests.
A pin is an image added to Pinterest. A pin can be added from a website using the Pin It button, or you can upload images from your computer. Each pin added using the Pin It button links back to the site it came from.
This 2 Descriptions is from : http://pinterest.com/about/help/
now, are you ready to Pin?
Source : http://www.loveinfographics.com