A custom ROM essentially replaces the stock ROM or skin on your phone with the one you choose to install.

The base of the Resurrected Bird is Resurrection Remix

You should Resurrection Remix Because of the following reasons
    To Penetrate the web and System
    To have Smooth Gaming Experience
    To have Smooth Phone Experience without any kind of Bootlware

The Base of the Ressurection Remix which is based on Android Open Source Project