It's actually strange as to why most PAL contries use 25fps as their base framerate. PAL could run at 40fps, or really anything. Same's true with NTSC. The only real difference is the way PAL and NTSC handle colors, and their resolutions that make them different.
PAL runs at 720x576 while NTSC runs at 720x486. These are the standards that were set when these formats were created. Despite TVs being able to handle other resolutions, and such, those are the broadcast-standard sizes for the two formats, meaning that's what everything made for TV is created at. That's the way it is.
HDTV, however, has about 3 sizes, but the generally accepted one is 1920x1080. That's a HECK of a lot more than standard NTSC, OR PAL. It's almost Film quality, but not quite. (I don't know exactly what film is, but I know it's slightly over 2000 wide.)
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