[1] On displays with a fixed refresh rate, a frame can only be shown on the screen at specific intervals, evenly spaced apart.
[2][3] Although VRR is strongly associated with video games due to such content having unpredictable, discontinuous frame rates that would benefit from the technology, it is also useful for media whose frame rate is fixed and known in advance, such as film and video.
Being able to sync the refresh rate with industry standard framerates (24, 30, and 60 FPS), it again helps to eliminate screen tearing.
[7] Since the 2010s, raster displays gained several industry standards for variable refresh rates.
Historically, there was only a limited selection of fixed refresh rates for common display modes.