In the TV world, 4K and Ultra HD are synonyms, so an UHD TV is the same as a 4K TV. A 4K television has 4 times more pixels than a Full HD TV. The image is much sharper and more detailed. Do you often stream movies or play on newer consoles? A 4K television is a good choice for your use. Many streaming services offer movies and series in 4K quality, and many new game consoles also support this resolution.