Before proceeding, ensure you have a installed and have backed up all personal data.
Custom ROM developers cannot legally include proprietary Google apps in their builds. A "flashable zip" is a specialized archive designed to be installed via a custom recovery (like TWRP or CWM) to bypass this restriction and integrate Google services directly into the system partition. Common GApps Variants for Jelly Bean Official Gapps For Android 4.1.1 Jellybean Flashable.zip
Includes the complete suite of apps found on original Nexus devices, such as Gmail, Maps, and YouTube. How to Flash GApps on Android 4.1.1 Before proceeding, ensure you have a installed and