Question: what is the difference between 4k ultra hd and 4k certified?
Answer: If only it were so simple. For starters, 4K and Ultra HD are not actually the same thing. 4K DCI, the likes of which you will find in a cinema, refers to a content resolution of 4096 x 2160, whereas Ultra HD is a consumer iteration with a reduced 2160p (3840 x 2160) resolution.