Android rooting or jail breaking is the process of allowing users of smart phones, tablets, and other devices running the Android mobile operating system to attain privileged control within Android's subsystem.
Rooting is often performed with the goal of overcoming limitations that carriers and hardware manufacturers put on some devices, resulting in the ability to alter or replace system applications and settings, run specialized apps that require administrator-level permissions, or perform other operations that are otherwise inaccessible to a normal Android user.
On Android, rooting can also facilitate the complete removal and replacement of the device's operating system, usually with a more recent release of its current operating system. Most of the time, rooting a device voids its warranty.