A joke is a sharp and funny u said occurrence. It's a short series of words spoken or written or little story with comic, ironic or burlesque purposes, contains a verbal or conceptual game capable of moving laughter. Often presents illustrated by a drawing, and can consist only in this.

One must distinguish the joke, which is to create a comic situation from a person, a situation or an actual event, while a gag joke differs in that humor is not verbal but visual as in the case of tartazo or release of cakes or cream cakes to someone's face characteristic of slapstick type comedy. (Wikipedia)