Back in 2013, they exceeded the 50 billion download mark and in 2017 there were more than 2.7 million applications available to be downloaded. Google's digital content distribution platform, previously known as Android Market, is the main Android app store, and the second of the world in turnover, just behind the iTunes App Store. If you're an Android user, you're not going to need any introductions to know what Google Play Store APK is all about.