How many Hz does the video standard PAL support?

The video standard PAL (Phase Alternating Line) supports a refresh rate of 50 Hz. PAL was primarily used in countries in Europe, Asia, Africa, and Oceania. The reason for PAL's choice of 50 Hz lies in the electrical power frequency used in these regions. The AC power supply frequency in these areas is typically 50 Hz, and by synchronizing the video refresh rate with the power frequency, PAL successfully avoids interference and flickering issues. Conversely, in regions like North America where the power frequency is 60 Hz, a different video standard called NTSC (National Television System Committee) with a refresh rate of 60 Hz is used.