Cyanogen Mod is a custom ROM for the Android devices.It offers a 'better' version than Google can provide, with more features and more control for the hardcore user.
It is a free and open source aftermarket firmware for android based smartphones.
CyanogenMod is built over Android. CyanogenMod is only a different version of Google’s smartphone operating system.
FEATURES OF CYANOGEN MOD:1.One main feature is its lightweight code which accounts for the stable and fast operating system.
2. It comes with numerous built-in features which are not found in Google’s version of Android.
3. Also absent are the unnecessary bloatware you are stuck with in stock versions.
4. Also it is the base for many other custom ROMs such as CarbonRom, PAC ROM, etc.
5. It comes with built-in root access for getting super-user privileges in the system. This also means that you can remove any system app if you find it of zero use.
6. It also comes with various customization which helps you to better manage and use your mobile device (more on that below).
7.CyanogenMod also comes with great privacy features such as Privacy Guard, Global Blacklist and CM Account.