Most Android devices default to the Google Play Store for downloading and installing apps, but it's far from the only place ...

If you own multiple Android devices, you shouldn't have to buy multiple copies of your apps. Fortunately, the Android Market makes it easy to install all of your paid apps on all of your devices ...

Sometimes, not every Android app will be available on the Google Play Store in your region, which means you'll need to install the APK file instead.