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What is 4K resolution? Our guide to Ultra HD viewing

4K Ultra HD (ultra high definition) is the resolution that brings you more pixels than ever to your home TV. But what is 4K, why do you need more pixels, and why does it matter whether you have a flashy 4K TV or simpler HD display?

Not so long ago, Full HD (full high definition) was the sharpest picture you could get. But now, 4K resolution is on the scene, bringing a whole new world of visual detail and clarity to our screens. 

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