What is Dithering

Atticus created an animation which he exported as an animated gif. One of the questions asked was whether he should “dither” the image. We looked up what diner meant and discovered it was:

Full-color photographs may contain an almost infinite range of color values. Dithering is the most common means of reducing the color range of images down to the 256 (or fewer) colors seen in 8-bit GIF images. Dithering is the process of juxtaposing pixels of two colors to create the illusion that a third color is present.
https://webstyleguide.com/wsg2/graphics/dither.html