It's an easy to use utility which allows you to send and receive files from different devices whether they are on the same network or not.
For this to work, all devices should have the free app installed for their respective platform. Then launch the app on both devices and click send and select the fotos/music/files that you want the other device to download.
A great way to exchange files (wirelessly) with devices you use regularly without having to bring along USB flashdrives.