The term 4K, which is also known as 4K Ultra HD, 4K Ultra High Definition, refers to the resolution of the TV, which is a measure of how much detail you can see on the screen. The decision of a traditional 1080p Full HD TV is limited to 1,920 columns and 1,080 rows of pixels, while a 4K Ultra HD TV has an increased resolution of 3,840 columns and 2,160 pixels rows. With the recommendation of four times of 1080p, 4K offers improvement in picture clarity over existing HD resolutions.