At its core Words with Friends is Scrabble. The draw here is that you can play friends and strangers over the internet. It also works on a delay so you log in, play a word and log out. It notifies your opponent who then does the same, like playing chess by mail in the old days. It's great in theory but it has a pretty limited scope and some serious issues that keep it from being a game I would wholeheartedly recommend getting.