A jumper is a type of clothing that covers the upper part of the body and the arms, typically with long sleeves, and is made of knitted or crocheted material. The term "jumper" is commonly used in British English, while "sweater" is more commonly used in American English. In the United States, "jumper" refers to a style of womens sleeveless dress worn over a blouse or shirt, while "jersey" refers to a knit shirt, especially if part of an athletic uniform. In British English, a sweater may also be called a pullover or jersey.

Its worth noting that "jumper" can also refer to other things, such as a short length of conductor used to make a connection between terminals of a circuit or to bypass a circuit, or a control flow statement in programming that allows the programs execution to transfer to a different part of the code. In telecommunications, a jumper function refers to the act of connecting two points or terminals together using a jumper cable. In circuit design, a jumper refers to a physical or virtual connection that is used to bridge or bypass certain components or traces on a circuit board.