Zune is a discontinued software program that was developed by Microsoft for Windows that functions as a full media player, library, media streaming server, mobile device management, and interface for the discontinued Zune Marketplace. The software is used to sync with all devices with Zune functionality including the Zune 4, 8, 16, 30, 80, 120, Zune HD, Windows Phone 7, and Microsoft Kin. Zune devices work exclusively with the Zune software, which applies many design principles of Microsoft's Metro design language.

Zune was a brand of digital media products and services that was marketed by Microsoft from November 2006 until it was discontinued in June 2012. Zune consisted of a line of portable media players, a music subscription service known as Zune Music Pass plus Zune Marketplace for music, TV and movies, streaming services for the Xbox 360 game console, and the Zune software media player for Windows PCs which also acted as desktop sync software for Windows Phone.