APK files are essentially Android package files that contain the installer for an Android app. To use an APK file on your PC, you'll need an Android emulator, which mimics the Android operating system on your computer. This allows you to run Android apps, including games, on your PC.
The process of using an APK file on your PC is relatively straightforward. You'll need to download and install an Android emulator, such as Bluestacks or NOX Player, and then download the APK file for the game you want to play. Once you've installed the emulator and downloaded the APK file, you can launch the game and start playing.