from wikipedia
Humour (humor in American English) is a form of entertainment and a form of human communication, intended to make people laugh and feel happy. The origins of the word "humour" lie in the humoral medicine of the ancient Greeks, which stated that a mix of fluids, or humours, controlled human health and emotion.

Different types of humour which appeal to different sectors of humanity exist – for instance, young children particularly favour slapstick, while satire tends to appeal more to the older and better-educated. Humour often varies by locality and does not easily transfer from one culture to another. This happens because humour often relies on a context, and someone not understanding the context will usually not understand the humour.