What is a Custom ROM?
Custom ROM is custom version of android operating system for rooted devices.
Why would I want custom ROM?
Take full control of your Android device.
Skip the bloatware and forced updates from your cell phone service provider. Custom ROM is for android enthusiast who want to fully customize their devices. Its also for the average android user who is tired of the bloatware and lock-down from the manufacturer or carrier. A Custom ROM allows you to change the way your device software looks and acts completely.
You need root first to get a custom ROM
Each custom ROM has its own special features and functions. Some are designed to look similar to stock, or the original manufacture loaded software, while others are completely different from original firmware.