4K is 4x the resolution of your HD TV. But what is Ultra HD? Ultra HD and 4K are interchangeable; Ultra HD refers to the aspect ratio of 3840 x 2160 pixels.
It was difficult to find things to watch in 4K, let alone stream in 4K. Now, thanks to 4KUNIVERSE™, the best picture quality is at your fingertips, watchable anytime, on any device*