iPod
Definition:
An iPod is a small, portable music player made by Apple. An iPod plays digital music purchased through Apple's iTunes Store as well as music ripped from compact discs (CDs). iPods come in several flavors such as the iPod Nano, the iPod Shuffle and the iPhone. Certain models of iPods also allow you to watch video such as movies and television shows. In order to transfer digital music and video to an iPod, it must be connected to a computer with Apple's iTunes software.
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Zune
A Zune is a small, portable music player made by Microsoft. A Zune plays digital music purchased through Microsoft's "Zune Marketplace" as well as music ripped from compact discs (CDs). There are several different flavors of Zunes; some allow you to watch video such as movies and television shows. In order to transfer digital music and video to a Zune, it must be connected to a computer running Windows XP or Windows Vista that has the Zune Software installed.