Topping 3million downloads Jetpack really is a globally recognised plugin by the majority of users. The main purpose of the plugin has always been to bring some of the tools and functions available with blogs hosted at WordPress.com to self hosted WordPress websites or in the words of Automattic themselves.
Back in the day, there were great features available to WordPress.com users that were not available on self-hosted WordPress installs. Jetpack is a plugin that connects to WordPress.com and enables awesome features, powered by our cloud infrastructure.