GApps, short for Google Apps, are a set of applications developed by Google that are pre-installed on most Android devices. These apps include popular services such as Google Play Store, Google Maps, Gmail, Google+, and many more. However, some custom Android ROMs do not come with these apps pre-installed, which is where the need for a flashable GApps package arises.
The background engine for notifications, maps, and account syncing. official gapps for android 411 jellybean flashablezip