Americans Use NTSC; Everybody else Uses PAL
NTSC is an analog TV color system used in North America, Central America, and parts of South America. PAL is an analog TV color system used in Europe, Australia, parts of Asia, parts of Africa, and parts of South America.
If you are sending your video files for authoring DVD-Video, you need to specify whether you need Acutack to author DVD in NTSC or PAL format. Blu-ray discs do not use either PAL or NTSC coding but rather are in the 1080p (p: pixels, of vertical resolution) worldwide high definition standard.