I dont understand pal and ntsc

Im gonna use Splinter cell to softmod my xbox but i dont understand what Pal or Ntsc mean. I think it has something where u live but if you could tell me i would really be happy.

 

PAL
Phase Alternation Line (PAL) is the analog television display used in Europe. PAL is one of three main standards along with NTSC and SECAM. One of the main differences in NTSC and PAL is that PAL scans the cathode ray tube 625 times as opposed to the 525 scan lines of an NTSC broadcast, which improves the image quality a tiny bit. Color variations exist between the two as well.

NTSC
NTSC is the National Television Standards Committee and was responsible for developing a standard protocol for broadcasting TV signals in 1953. Not many changes have been made to this protocol since its creation except the addition of new parameters for color broadcasts. The NTSC broadcast has 525 horizontal scan lines which are drawn in an interlaced fashion. The result is one frame every 1/30 a second.

This probably isn't what you are looking for, but I had a link handy for the definitions. As far as your soft-modding, I think you can find the info you are looking for in the guides. Just search the forums.