[What is] Rooting?

-Android OS are free are used by any mobile developers. But users are not allowed to use their android OS as freely. In other words, user can use their android OS as stay version and not let to use as administrators. 

-Since android OS is free for everyone, users also want to use their android OS freely. In Linux OS, in order to use kernel as freely, Linux must be rooted. As android OS is based on Linux OS, android can also be rooted to use freely. 

-Rooting can break warranty because rooting delete admin seal of original device.

-If so, by rooting, what we can get?

-By rooting, we can get more performance as usual. If you are a programmer, you can freely customize your OS and can create your own custom ROMs. More clearly, you are now a administrator (super user) of your android after rooted and can control freely.

-But, rooting can access to the device main (system) files, if you deleted one of these files, your phone will fail to boot. However, you can fix by installing a new firmware.

-For a normal user, what we can do?

-We can create new themes. We can over clock CPU to get more performance. We can try powerful root only app. We can customize our boot loader. Can backup system files. We can uninstall original apps that are not used. We can try to use battery more usable. See the photo, customized incoming call screen on rooted phone.

-Your phone may hang. But if you are interested in mobile technology, you can upgrade to new versions.