WordPress is a free and open source blogging platform that is very extensible. It comes with the ability to add plugins right into the platform on your web server. Nevertheless, there is some functionality you might not be able to easily achieve on your own hosting account without administrative access or even a second server.
Features like service monitoring just might not be practical for the average user to install and maintain. Jetpack is a free service from WordPress that allows you to leverage your WordPress.com account to install additional services into your self-hosted WordPress website.
Jetpack itself is a plugin, and in the latest versions of WordPress, it is available by default. All you have to do is activate it. If you have an older installation that you have upgraded, you might need to search for the plugin and install it manually. Once activated, it will ask it to connect to your WordPress.com account. If you do not have one, you can create one, even if you do not intend to have a blog on their site.
You will now have a Jetpack section right under “Dashboard” in the side menu. You will have access to features like Photon – a free content delivery network (CDN), a mobile-friendly theme, an image carousel, a remote website monitor that notifies you if your site goes down, and much more. All of these tools are seamless and integrate right into your self-hosted site. For more information about WordPress Jetpack, visit the Jetpack team website.