Some people didn't know what root is all about before they jump into the ocean of tweaking their phones. They're not aware of dangers involved in rooting, but they simply want to do the extraordinary at all cost without siting the negativity involved.
Disadvantages of Rooting.
1. Lose Warranty: Rooting has to do with tampering of system files and granting of superuser access. Once you root your Android phone, you can no longer claim the warranty. The highlight of the danger is, if you root your phone today and it fails to turn-on tomorrow, service centres won't accept it back unless you're lucky.
2. Open doors for malwares: The moment you root your device it's no longer on the safe side because any application can get direct access to your system file and your privacy. Root open all doors to your files.
And there many other reasons that time won't permit me to say. For instance, you may not be able to receive new updates or upgrade your phone after root. If for now you feel like unrooting your Android smartphone. Simply follow the guide in the link above and you should be through in few minutes. PC is not required. newbielink:http://www.ccnworldtech.com/2015/04/how-to-easily-unroot-android-phones.html [nonactive]