Oh I apologize. Well, an android phone is sort of like a computer. They have files, such as the operating system and other system files. The SD card on your phone is comparable to the hard drive on your computer, where all user data is saved. Being rooted gives you access to all the system data and directories on your phone. This pretty much gives you free reign to whatever you want to do in your phone. This includes raising the maximum volume on your phone, turning the brightness below the minimum value, and make the phone faster by changing the system or "flash" a custom rom. And Volume+ is only for root users.
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