The 4K TV is an emerging technology that has a resolution of 3,840 x 2,160 pixels, 8 million pixels in total, and that is four times the number of Full HD (1,920 x 1,080). ... 4K is the ultimate choice for crystal-clear clarity. Especially effective on very large screens, 4K TV is also known as Ultra HD or UHD.

4K resolution refers to a horizontal display resolution of approximately 4,000 pixels. Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 3840 × 2160 is the dominant 4K standard, whereas the movie projection industry uses 4096 × 2160.

But it might not be the raw resolution of 4K that tempts you into your next TV

While a select number of truly premium sets on the market are now opting for 8k resolution instead, 4K is still the king. At least for now. All the new sets announced at this year's CES 2020 expo are pushing the Ultra HD resolution.

You’ll have likely seen the 4K label on adverts, at your local high street retailer and mentioned in our TechRadar TV reviews. But although the claims about a better, brighter picture sound great, what really is 4K? What do you need all of those pixels for? And, why does it really matter whether you have a flashy 4K TV or simpler HD display?

4K Ultra HD (ultra high definition) is the eye-popping resolution that brings more pixels than ever before to your home TV. 

It wasn’t that long ago when Full HD (full high definition) was the sharpest picture you could get on your TV. That’s all changed now 4K resolution is on the scene. This tech brings a whole new world of visual detail and clarity to our TV displays.

It may be new and sound great, but it’s also everywhere. It's pretty hard these days to get a TV that isn't 4K, with even budget small TVs opting for the detailed resolution to entice viewers.