Android operating system uses Android Package Kit (APK), a file format for the distribution and installation of mobile apps and middleware. An APK file includes all the software program’s code and assets, such as compiled application code, resources, assets, certificates, and manifest file. While downloading an app from Google Play Store, it appears as if the app is directly installed in the phone, but it is actually an APK file. These files can be manually installed onto the Android phone without using the Google Play Store through a process known as “sideloading.”

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