A mobile software application developed for use on devices powered by Google's Android platform.

• Available in the Google Play Store.
• Apps can run on Android smartphones, tablets, Google TV and other devices.

iOS is a mobile operating system developed by Apple. It was originally named the iPhone OS, but was renamed to the iOS in June, 2009.

• Currently runs on the iPhone, iPod touch, and iPad.

Online store for downloading free and paid BlackBerry applications from third-party developers.

• Downloaded directly to the user's phone, not via the computer.

Windows Phone is a mobile operating system for smartphones and mobile devices from Microsoft.

• Based on the Windows CE kernel.
• Designed to look and operate similar to desktop versions of Microsoft Windows.