LED, LCD and plasma TV: HD TV explained What is HD TV?

HD TV images can be clearer, sharper and more detailed

High-definition television, or HD TV, produces better pictures and sound than standard-definition television. HD offers more colours and a higher resolution picture (twice as many horizontal lines). This can make HD TV images clearer, sharper, more detailed and more lifelike.

How do I get HD TV?

To watch HD TV you need two things: an HD-ready TV and HD TV broadcasts to watch. 

HD TV is available via Sky or Virgin subscription services or free of charge from satellite provider Freesat. HD channels are also available free of charge through the HD service from Freeview, as long as you have the right equipment. Freeview HD is not broadcasting in all areas yet - check the Freeview website to find out whether you can get the service where you are. 

Bear in mind that even if you take one of these HD services, it doesn't mean everything you watch will be in HD. High-definition content is still limited to a number of channels. 

To get started, you need an HD-ready television and one of the following:

• subscription to an HD service from Sky or Virgin - an HD set-top box to decode the signal is included with your subscription
• a Freesat or Freeview HD box (if your TV doesn't have a built-in Freeview HD tuner) - this might be more suitable if you don't want to commit to a contract and monthly payment.

If you want to listen to HD Dolby digital sound, you'll also need a compatible home cinema system connected to your TV.

For the lowdown on the latest HD TVs and HD set-top boxes, check out the Which? LCD and plasma tv review and the Which? Freeview and Freesat set-top boxes review.