APK (file format) facts for kids
APK is the file format that software for Android is distributed in. It is an extension of the ZIP file format. An APK file contains bitcode for Android's Dalvik Virtual machine, resources used by the program (such as images and sounds), and sometimes native executable code, usually for the ARM processor.
APK Packages can be downloaded from various websites available online:
APK (file format) Facts for Kids. Kiddle Encyclopedia.