What is chromecast and how does it work?

Hello,
Chromecast is an enlarged thumb drive-sized dongle that plugs into a modern television set's HDMI (High-Definition Multimedia Interface) port and allows you to stream (or rather cast) media from your existing computer or mobile device through your home WiFi network and onto your TV screen.
Thanks.
For more to go :-
Chrome Cast Com Setup
Chromecast Com Setup