What is an APK file?

An APK file is an installation file for Android applications, the advantage of using APK installer files over downloading from the Google play store is that you can share the file offline with your friends and create a backup of the applications in case you need to format your Android device.
But downloading and installing APK files from unknown or untrusted sources is that they could be malware applications trying to steal your private data or could be used to hack into your Android device and cause a potential security issue.

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