What is APK?

APK (Android Application Package) is the package file format used by android operating system for installation mobile apps

How to Install APK on My Phone?

Go to Settings—> Applications—> Enable UNKNOWN Sources

Browse your downloaded APK using file manager and select the APK File you want to install


What is XAPK and How to install it on My Phone ?

In Short, XAPK is APK file + APK Expansion File (OBB) Which is required by some apps.

To install XAPK. use XAPK Installer. you can get it here