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.