It is available on most Android devices, and Google Play comes pre-installed on devices that support it.
An exhaustive list of supported devices is available on Google's website, but it includes most major Android smartphones.
Many tablets also work with the Google Play store when they use Android as the operating system, such as Samsung's Galaxy tab.
Devices that won't work with the Google Play store include Apple and Windows devices, and BlackBerry devices apart from the Priv.
Unlike with iOS, here are several other major app stores for Android including the Amazon app store and Slide ME and F-Droid.
The most popular games by number of downloads are Subway Surfers, Candy Crush Saga, Pou, Temple Run 2 and Hill Climb Racing.