The APK is a package file that contains all the necessary files of the application you want to install. In short, we can call it the installation file. You can also take advantage of the mod apk download option in this way.
Apps downloaded from the Google Play Store are actually installed on the device as APKs. Then the Android operating system will automatically open the APK package file and install the application. Google Play Services app, one of the default apps on your Android device, also checks this APK file to let you know if the app is up to date. The apk file is a completely clean file.
APK (package file/installation) of all applications running on the Android operating system is available. Therefore, you can install Android apps from foreign markets or websites by granting the necessary permissions.