APK files are application packages that have been created for Google's Android mobile operating system. The Android operating system is based on the Linux OS and was initially developed by the Open Handset Alliance for use on mobile phones, however, the Android OS is now being used for mobile tablet devices in addition to mobile phone usage.
The files that contain the .apk file extension store the files that are needed to run a single Android application on an Android mobile device. The .apk file itself is a compressed file archive that contains the code files for the application, the AndroidManifest.xml file and the application resource files.
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