It is addicting!!! It has everything from a collection of crafts, to recipes, to animals, to fashion, holiday ideas.. You see something you like and click it. If you still like it you click it again and it shows you the recipe or the how to of it. And you "pin" it to your board under your own heading so you can find it again.
To me, it's like a virtual corkboard. Instead of of using your push pin to pin up sticky notes on a topic of interest, you can do it virtually with Pinterest, and have a virtual "corkboard" come to life.