The terms UHD and 4K have become so conflated that TV makers, broadcasters, and tech media use them interchangeably—but ...

For simplicity's sake we'll refer to the technology as 4K here, but you will find it called Ultra HD just as often - it essentially refers to the quality of the video picture you're seeing ...

If your screen is too small or too far, it becomes harder for the human eye to discern the difference between Full HD and 4K resolution. For TVs, we recommend a screen size of at least 50 inches ...