What Is 4K? This Is What You Need To Know

So, what is 4K, really?

Yes, it's video. Yes, it's more HD than HD. And yes, it's worth it.

With over two times the resolution of HD, it boasts an ultra-high-definition image that matches traditional 35mm film. Manufacturers have rushed to make 4K a feature in many flagship products, and both TVs and cameras (and soon, smartphones) have already started to carry sleek '4K' branding.

But what is the technology involved - and how much better is it really? How obvious is the difference - and when are you going to need to pay for one?

Check out our guide to 4K and our tips on when to invest in a next-generation screen above.