High Definition TeleVision is what HDTV literally means. But high definition compared to what? In order to answer this question, we need to know a bit about the original analog TV system.

Analog TV
30 images per second (in Europe 25) are shown by normal analog TV sets. It does this by writing image lines horizontally, 525 lines in one image (In Europe 625) on the screen. The number of pixels on one line is about 500. This would be a definition of 500 pixels per line by 525 (or 625) lines. Compared to modern computer monitors this is really bad. Even the lowest resolutions monitors have higher resolutions (640 x 480) than an analog TV.

The numbers of those who just connect their TV to a simple roof top antenna can probably be counted on the fingers of one hand. I assume you are not one of those minimalists who need 30 minutes of news programming to get by in a day. Most likely, you are one of those millions who want 200+ channels in their home and are wondering which of the biggies to choose.

It was in October 2001 that General Motors Hughes (Parent company of Direct TV) and EchoStar Communications Corp., trader of Dish Network agreed to a merger. The new company would have improved the services for satellite TV clients by adding many HDTV channels and local channels would then be available to all satellite TV viewers.

However, the US Department of Justice blocked the merger.
Why did they do that?