This is the name of the smart home Action that you can connect to from the Google Home app. Chromecast with Google TV requires a TV with an HDMI port, a Wi-Fi network, a Google Account, a nearby electrical outlet, and a compatible mobile device. Google tv audio out of sync This might all sound very confusing, especially if you remember the fact that Google had Google TV up until it killed it off in 2014 in favor of Android TV.
