A need for any rooted phone! Almost all rooted applications need busybox to realize their magic, if you have a rooted phone, then you need busybox.
Keep in mind that I didn’t write BusyBox! I wrote this installer and compiled cross busybox for Android. Please refer to the menu option about more details or here: www.BusyBox .net
BusyBox is a software application that provides many standard UNIX tools, as well as the largest (but most capable) utilities of GNU Core. BusyBox is designed to be a small executable for use with the Linux kernel, making it ideal for use with embedded devices. It has been renamed “The Knife of the Swiss army of embedded Linux