JetPack is a WordPress plugin that bundles some of the top WordPress features. JetPack's features include statistics, a Twitter® widget, WP.me shortlinks, gravatar hovercards, ShareDaddy, and more!
We think JetPack is pretty amazing — which is why we pre-install it on our WordPress Hosting. But if you think differently, you can always deactivate and delete it through the Plugins menu.