You’re describing the Chromecast with Google TV. The vanilla Chromecast dongle has no app support; all you can do is cast your media from your phone and hope it works out.
It was novel when it came out, but they stopped making any serious improvements years ago, to the point now where YouTube casting is hot garbage that drives you insane if you want to view more than a couple videos in a row. I have constant problems with all of my cast devices with maintaining connection to the dongle, with media playback, you name it.