is a creative process where one or more artists collaborates on drawing or painting one single comic
. Often the process is that one artist creates the first page, and then another artist creates the second, and a third does the next, and so on.
There is no script that the artists work from, they just make it up as they go along.
The second artist working on the comicjam, makes his page the best way he can, based on what happened on the previous page.