Learn in the textbookApplications of 3D and Video Media
Definition4K is an ultra-high-definition video standard with about 4,000 pixels across (typically 3,840 × 2,160).
ExplanationA pixel is one of the colored dots that make up a screen, and on screens of the same size, more pixels mean a finer image. The typical 4K resolution doubles both the width and the height of Full HD (フルハイビジョン, 1,920 × 1,080), so the total pixel count is about 4 times larger.
AnalogyIt is like covering the same floor with slightly smaller tiles instead of large ones, which makes the curves in the pattern look smoother.
Memory hookK is kilo (thousand). 4K = about 4 thousand dots in a row across.