Some countries use a different system
PAL
The system you have been studying up to now is called the NTSC system. It was named for the National Television Systems Committee, which created it in 1953 when the United States adopted its color television system. NTSC is used in North America, Japan, and many other parts of the world.
When the countries of Europe decided to adopt a color TV system, however, NTSC was 10 to 15 years old, and its weaknesses and problems were well known. In addition, technology had made long strides that allowed the Europeans to develop television systems that were superior to NTSC. The most commonly used system besides NTSC was developed in Germany and is called PAL for Phase Alternate Lines. The luminance and color detail ...
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