What is APK?

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The APK abbreviation means Android application package file (APK).
APK is the file format which is used to distribute and install applications onto Android OS. In order to make such file, a program for Android is first compiled, and then all of its parts are packaged into one file.
The APK file contains all of that program's code (such as *.dex files), assets, resources, manifest file and certificates.
APK files can have any name needed, but the file name always ends in ".apk". These files are “ZIP” file formatted packages which are based on the “JAR” file format, with “.apk” file extensions.