It offers additional features and options which not found in the official firmware distributed by vendors of these devices.
Features supported by CyanogenMod includes
Theming support, FLAC audio codec support, a largeAccess Point Name list, an OpenVPN client, an enhanced reboot menu, support for Wi-Fi, Bluetooth, and USBtethering, CPU overclocking and other performance enhancements, soft buttons and other “tablet tweaks”, toggles in the notification pull-down (such as wi-fi,Bluetooth and GPS), app permissions management, as well as other interface enhancements.
CyanogenMod does not contain spyware or bloatware. In many cases, CyanogenMod may increase performance and reliability as compared to official firmware releases.
CyanogenMod is developed as free and open source software based on the official releases of Android OS with added original and third-party code.
Top phones available in market which comes CyanogenMod.