httpen.wikipedia.orgwikiJoke

A joke is a question, short story, or depiction of a situation made with the intent of being humorous. To achieve this end, jokes may employ irony, sarcasm, word play and other devices. Jokes may have a punchline that will end the sentence to make it humorous.

A practical joke or prank differs from a spoken one in that the major component of the humour is physical rather than verbal (for example placing salt in the sugar bowl).