Google makes two shapes of the same idea: the Google TV Streamer, a small sloped box with Ethernet, and Chromecast with Google TV, a dongle that hangs off the HDMI port. Both run the same Google TV software and set up nearly identically — fastest through the Google Home app on a phone.
Menus in this guide come from Google’s setup documentation. Google TV updates arrive often and can rename a menu; the words on your screen win.