http://www.washingtonpost.com/blogs/the-switch/wp/2017/09/21/the-new-apple-tv-4k-finally-catches-up-to-its-competitors/

Apple is continuing its push into the living room, and is making sure that its main vehicle for its entertainment ambitions — the Apple TV — is ready for the future. By adding support for 4K content, Apple joins competitors such as Roku in having shows and films in this super-high definition quality available to watch. But, because it is Apple, the company has done so with its own particular flair. The company provided me with a review unit to test before it hits store shelves Friday.

Before we dig in, we should get something clear. Apple TV 4K is not an Apple 4K television set. It is a 4K-ready version of its existing Apple TV, a hockey puck-sized box that plugs into your television. Through it, you can access any movie or show you've bought through iTunes, as well as through streaming apps such as Netflix or Hulu. Apple is also adding Amazon Video — the last of the major streaming services it didn't yet have — sometime this year.