A joke is something spoken, written, or done with humorous intention. Jokes may have many different forms, e.g., a single word or a gesture (considered in a particular context), a question-answer, or a whole short story. The word "joke" has a number of synonyms, including wisecrack, gag, prank, quip, jape and jest. To achieve their end, jokes may employ irony, sarcasm, word play and other devices. Jokes may have a punch line, i.e., an ending to make it humorous.
A practical joke or prank differs from a spoken joke in that the major component of the humour is physical rather than verbal (for example placing salt in the sugar bowl).