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You would have often come across the names of High Definition and Ultra High Definition in terms of quality of images and videos. What does that mean? A high definition is the resolution level of 1920×1080 pixels whereas an Ultra High Definition resolution is of 3840x2160P. So, an Ultra HD TV has more pixels per inch which imparts it a higher resolution. The UHD devices include the ones which provide 4k as well as 8k resolution. 4K refers to horizontal display resolution of approximately 4000 pixels (3840x2160P) In case of 8K, the resolution is of width of 8000 pixels (7680×4320).