ITunes is a media player application used to play, download, store, and organize digital music and video files on desktops or laptops. It can also handle content on iPod, iPhone, iPod Touch and iPad.
iTunes can connect to the iTunes Store to purchase music, music videos, TV shows, iPod games, audiobooks, podcasts, movies and rental movies (not available in all countries) and ringtones (available on iPhone and iPod Touch 4th generation only ) and download). It is also used to download application software from the App Store for iPhone, iPad and iPod Touch
With iTunes in the cloud, music, apps, and books you purchase will automatically appear on all of your devices. Or you can just download the things you want to the devices you use