Fair use is a limitation and exception to the exclusive right granted by copyright law to the author of a creative work. In United States copyright law, fair use is a doctrine that permits limited use of copyrighted material without acquiring permission from the rights holders. Examples of fair use include commentary, criticism, news reporting, research, teaching, library archiving and scholarship. It provides for the legal, unlicensed citation or incorporation of copyrighted material in another author's work under a four-factor balancing test.

The term fair use originated in the United States. A similar principle, fair dealing, exists in some other common law jurisdictions. Civil law jurisdictions have other limitations and exceptions to copyright.

The legal concept of "test copyright" was first ratified by the United Kingdom of Great Britain's Statute of Anne of 1709. As room was not made for the authorized reproduction of copyrighted content within this newly formulated statutory right, the courts created a doctrine of "Fairness Abridgement" in Gyles v Wilcox, which eventually evolved into the modern concept of "fair use", that recognized the utility of such actions. The doctrine only existed in the US as common law until it was incorporated into the Copyright Act of 1976, 17 U.S.C. § 107.

A fair (archaic: fayre) is a gathering of people to display or trade produce or other goods, to parade or display animals and often to enjoy associated carnival or funfair entertainment. It is normally of the essence of a fair that it is temporary; some last only an afternoon while others may last as long as ten weeks. Activities at fairs vary widely. Some trade fairs are important regular business events where either products are traded between businesspeople, as at the Frankfurt Book Fair, where publishers sell book rights in other markets to other publishers, or where products are showcased to largely consumer attendees, as for example in agricultural districts where they present opportunities to display and demonstrate the latest machinery on the market to farmers.

Fairs are also known by many different names around the world, such as agricultural show, fête, county fair, exhibition or state fair, festival, market and show. Flea markets and auto shows are sometimes incorporated into a fair.

Use may refer to: