Cel animation is a type of traditional animation where artists draw each frame by hand on transparent sheets of plastic called “cels.”. These cels allow characters and foreground elements to be layered separately from static backgrounds, creating dynamic sequences without the need to redraw every element in a scene. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.