A 4K screen has a resolution of 3840 x 2160 pixels, which is also called Ultra High Definition (UHD). This is four times as many pixels as Full HD 1080p, which has a resolution of 1920 x 1080.

Here’s how it works. The best 4K Blu-ray players deliver the ultimate picture quality for watching movies and TV series at home. Although streaming services are popular, Blu-rays deliver video ...