Chromecast is a dongle developed by Google that plays audio/video content on a high-definition television by streaming it via wifi from the internet or local network.
The Chromecast is the first expansion of the Chrome operating system out of traditional forms of computing. Up until now, Chrome OS was a desktop operating system, designed for use on a laptop or monitor. Google retooled it for the living room and tapped mobile operating systems to provide the content.
The Chromecast is designed first to be a streaming device. It’s supposed to be the easiest way to get YouTube and Google Play and Netflix and Pandora and photos on HDTVs. Think Apple TV, but rather Google TV with another name (because, well, Google TV is already a thing).
The Chromecast uses an AirPlay-type system to provide content to the device. From Android or iOS, users simply hit a button on YouTube to load the video on the other screen. Quick and easy.
Source:Google
