What kind of difference can it bring? Isn’t one fps not a big difference?
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TVs in the Us were originally based to work based on the frequency of mains electricity. The Us sues 60 hz mains electricity so a rate like 30 or 60 frames per second is easy to do without much in the way of expensive tech. (European TV standards where electricity is at 50 Hz use 25 and 50 fps instead)
Later color TV was a thing and the NTSC standard had to move slightly away from 30 hz to make that work to 29.97 hz or 59.94 Hz for interlaced stuff.
This sort of stuck around long after it was necessary and even today TV sets may be optimized to work at that rate while computer displays often work with the flat 60 hz)
Ideally both your computer and your display should be able to use whatever frequency, but giving the option of either 59.94 or 60 hz ensures that it works well with any setup.
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