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.

If the idea of paying a subscription fee each month for HD television programs doesn't appeal then you'll be pleased to know that the Sony D-49XF7073 comes with Freeview HD built in. Freeview HD is the high definition big brother to Freeview and allows you to enjoy completely free access to HD stations such as BBC HD and many more. There are currently over 50 Freeview HD stations, with the line-up constantly being revised and added to. 

While there is no industry standard for what a 'Smart TV' is, the term is used to describe a TV that combines a Television set with computing and internet capabilities. (Not unlike a smart phone such as the iPhone). The remote takes the place of a mouse and you use a friendly graphical user interface to navigate content.

Smart TVs also let you access IPTV - Internet Protocol Television. A development that is touted to be the next 'big thing' in Television. For more info on IPTV, visit this website.

The term Smart TV was originally used by Samsung but has been adopted by other TV makers such as LG and Philips.

What can you do with a Smart TV?

• Access social networking sites like Twitter and Facebook
• Stream content from home computers
• Access video, photos and music stored on your phone
• Browse the web
• Play games
• Watch YouTube videos
• Stream music and photos from the web
• Download and use Apps
• Search for content

Further reading: What is Samsung Smart TV

Smart TV - what you need to know.