another way for noobs to understand root is public and private access. anything you can change/delete has public access, but for the built in ringtones and apps like amazon mp3 are stored under private access and require admin credentials which is where SU comes in. rooting allows you to use the phone to the full extent the hardware provides instead of being locked out by the carrier or any other reason. tethering, apps to sd, swapper, multitouch, set cpu clock, and various other nerd stuff. lots of files are stored under private for good reason if you dont know what it is you probably shouldnt mess with it or your phone could brick. noobs should leave root to the geeks and people who have geek friends
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