4K refers to the resolution of a television. a 4K TV is the next step up from an 'HD' TV. The [product_name] features 4K resolution. It refers to the amount of pixels (the little dots that make up the overall TV image). A 4K display will have around 4000 pixels horizontally, and is roughly 4 times the amount you get with a 1080p TV (a regular HD TV).

4K TVs are very popular in the gaming world, where new consoles support and have improved graphics for 4K tellys.

Can you notice the difference though? It seems strange that at one time everyone wanted an HDTV and now there's this 4K thing. The difference is definitely noticeable (check out your local electrical retailer and compare them side by side). The display is crisper, lines are more detailed and everything looks really sharp.

If you are in the market for a new TV then definitely think about future-proofing and look at getting one with 4K. It's here to stay and looks set to replace older style 1080p HD TVs.