What is a small network appliance and entertainment device that serves as a the media player for the iTunes Store?
TV (software):  It also serves as a media player for television shows and films purchased in the iTunes Store, replacing the "Videos" application on earlier versions of iOS. Apple TV: Apple TV is a digital media player and microconsole developed and sold by Apple Inc. It is a small network appliance and entertainment device that can receive digital data from a number of sources and stream it to a capable television.
Apple TV