HD television is offered in several resolutions. The most common is 1920 pixels wide by 1080 pixels high, known as 1080i or 1080p. Less common but still HD is 720 line (1280 x 720).
Both 1080i and 720p are considered to be full HD and are the two standards used in broadcast today. 1080p is the same resolution as 1080i but the image is refreshed at twice the rate of 1080i. It is not currently being used for broadcast and is seen only on local sources such as games consoles, Bluray players etc.
There is another HD standard of 1035 lines. Used in Europe very briefly, it rarely if ever is used today and most modern television equipment won't support the format at all.
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