Apple TV is small device that attaches to a TV using HDMI and streams content from iTunes, Netflix, Hulu Plus, YouTube, and sports leagues, as well as content on computers using iTunes Home Share over a wireless or wired connection. It's controlled either via an infra red remote control device, or via an app on an iOS device. It runs a version of iOS that is essentially similar under the hood to normal iPhones and iPads.
Apple TV is a digital media receiver developed and sold by Apple Inc. It is a small form factor network appliance designed to play digital content from the iTunes Store, Netflix, Hulu Plus, YouTube, Flickr, iCloud, MLB.tv, NBA League Pass, NHL GameCenter or any OS X or Windows computer running iTunes on an enhanced-definition or high-definition widescreen television.
This tag is for questions relating to the Apple TV's hardware or software.