The difference between SDTV and HDTV?

[Senlis]

Pyro as Bill said:

Senlis said:
The main difference between SDTV and HDTV is resolution. Also, SDTV is cathode ray tube (CRT) and HDTV is usually either LCD or Plasma.

 

 £50 says there are more CRT HD displays available than LCD/Plasma.

I guess it is just my area, but whenever one of my friends get a HDTV it is usually LCD or Plasma.