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What is an APK File? Just like Windows PC systems use a .exe file for installing software, Android does the same. An APK file is the file format used for installing software (usually games or apps) on the Android operating system.
The apps come as APK files so that they could be installed on an Android device. Now the thing is, unlike the .exe and .dmg files, these files cannot be installed directly, and we will have to make some arrangements on our Android device first. So let’s see how can you install these APK files manually when you get one someday.
First of all, we will have to enable the option to install the applications from unknown source on our Android. Open your Android system settings and click on Applications (Programs for some of the HTC devices) and check the option Unknown source. Those of you who are on Android ICS 4.0 you will find these settings under the security settings. On most of the devices, you can now simply click on the file using any of the file managers to install them, using the built-in package manager. If your device does not have a package installer by default, you can download and install an APK installer application from Google Play.
When you want to install an APK manually, just open the APK installer app and navigate to the folder where you have your APK files saved. Now, simply click on the application to bring on the installation screen. Click the install button to successfully install the application.