Android devices have the ability to "sideload" applications that aren't available on the Google Play store. Here's how you can do it.

Setting up your device

From your smartphone or tablet running Android 4.0 or higher, go to Settings, scroll down to Security, and select Unknown sources. Selecting this option will allow you to install apps outside of the Google Play store. Depending on your device, you can also choose to be warned before installing harmful apps. This can be enabled by selecting the Verify apps option in the Security settings.

Downloading an app

The next step will be finding an Android package file, also known as an APK, which is the way Android apps are distributed and installed. This is where some people usually run into trouble. Never, and I mean ever, use sideloading as a way to pirate applications; doing so will likely result in your Android device getting a virus. You should only download APK files from trusted developers and companies.

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The process

You can either download the APK file on your mobile device or on your computer, although the latter is a little more difficult. To get started, download an APK file using either Google Chrome or the stock Android browser. Next, go to your app drawer and click Downloads; here you will find the file you just downloaded. Open the file and install the app.

If you downloaded the APK file on your computer, the process is slightly different. You must connect your Android device to the PC and enable USB mass-storage mode. The next step is to drag and drop the file onto your device. Then, using a file manager, such as Astro or ES File Explorer, you can locate the file on your device and install it.

Remember to be careful when downloading apps outside of official Android marketplaces like Google Play and Amazon's Appstore.