iTunes is a media player and media library application developed by Apple Inc. It is used to play, download, and organize digital audio and video on personal computers running the OS X and Microsoft Windows operating systems. The iTunes Store is also available on the iPod Touch, iPhone, and iPad. Through the iTunes Store, users can purchase and download music, music videos, television shows, audiobooks, podcasts, movies, and movie rentals in some countries, and ringtones, available on the iPhone and iPod Touch (fourth generation onward). Application software for the iPhone, iPad and iPod Touch can be downloaded from the App Store.