APK stands for . It is the file format used by the Android operating system for the distribution and installation of mobile apps. Think of it as an executable file (like a .exe file on Windows). By downloading an APK manually, you bypass the automatic update restrictions and install a specific version of the app directly onto your device.
: A reliable older version often used for troubleshooting older devices. How to Install the APK Manually Google Play Store Apk For Android 4.4 2