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Originally Posted by towny
Digital TV just allows you to deliver your standard 625 lines of picture information in a different way, that is less prone to interference.
High-Definition TV improves the resolution of the picture you watch, so instead of being made up of 625 lines of picture information, it is made of rather more - somewhere over 1,000, IIRC.
The lines of information that make up your picture are drawn horizontally, so it doesn't matter whether you have an old 4:3 or a new 16:9 (widescreen) aspect ratio TV, the picture is only 625 lines.
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576 lines actually
The other lines are known as the vertical blanking interval (VBI) and are not sent. Your STB re-generates the VBI lines in order for your TV to lock onto the pics.