What is Rooting on Android ?

Rooting is the process of allowing users of smartphones, tablets and other devices running the Android mobile operating system to attain privileged control (known as "root access") within Android's sub-system.

        Rooting is often performed with the goal of overcoming limitations that carriers and hardware manufacturers put on some devices. Thus, rooting gives the ability (or permission) 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.

kingo root tool download here

                   OR

iRoot tool download here

* this  tools work only 90% android devices

Step one: Download and install any one root tool [from above links]

Step two: Enable USB debugging mode on your phone. If it's running Android 4.0 or 4.1, tap Settings, Developer Options, then tick the box for "USB debugging." (You may need to switch "Developer options" to On before you can do so.) On Android 4.2, tap Settings, About Phone, Developer Options, and then tick USB debugging." Then tap OK to approve the setting change.

On Android 4.3 and later (and some versions of 4.2), tap Settings, About Phone, then scroll down to Build Number. Tap it seven times, at which point you should see the message, "You are now a developer!"

Step three: Run Android Root on your PC, then connect your phone via its USB sync cable. After a moment, the former should show a connection to the latter.

Step four: Click Root, then sit back and wait while the utility does its thing. The aforementioned Supreme took all of about two minutes, including the automated reboot at the end and successful

* do with own risk because warranty void[out of warranty] and some times brick[dead] your mobile