This video explains how cel shading works by looking at Legend of Zelda: The Wind Waker

In 2002 Nintendo released Legend of Zelda: The Wind Waker for GameCube. One of the great things about the title (which was not well received when it first came out but is now rated highly in the Zelda pantheon) it its pioneering use of cel shading - a stylistic technique to add shading to 3D graphics to make them look less realistic (in a bad way) and more cartoony (in a good way). Even Breath of the Wild puts the cel shading aesthetic to good use.

In the 14-minute video, "How The Wind Waker Defined Cel Shading," Michael "Jasper" Ashworth goes into interesting detail about how Nintendo "was able to pull off cel shading at a time when nobody else was able to."

If you are at all interested in 3D graphics, and the history of video games and how they were made, Jasper's video channel is a must-watch. My 16-year-old daughter told me about him a while back. He only has about 30k subscribers, and he deserves 100 times that number, given the quality of his work.