Its the best screen casting and mirroring device in market.
You can cast your favorite TV shows or movies directly from your mobile apps like youtube, netflix to the TV, all you need is a wifi connection and high speed internet service.
Most of the web based entertainment content supports screeen casting these days, so chromecast is a must have device if you want to enjoy your shows on a big screen.
Not only can you cast but you can mirror your mobile device or laptop to the TV screen. Whatever you are seeing on your phone can be mirrored to your TV, you can play songs and route the audio to your TV.
All you need is a TV with HDMI port for the chromecast to be inserted in there.
I am a happy buyer of chromecast and always carry it alongwith me when I travel to a different place.