A whip is a tool, traditionally designed to strike animals or people to aid guidance or exert control over animals or other people, through pain compliance or fear of pain, although in some activities whips can be used without use of pain, such as an additional pressure aid or visual directional cue in equestrianism. Whips are generally of two types, either a firm stick designed for direct contact, or a flexible whip that require a specialized swing to be effective, but has a longer reach and greater force, though may have less precision. There are also whips which combine both a firm stick (the stock or handle) and a flexible line (the lash or thong), such as hunting whips.
The majority of whips are designed for use on animals, although whips such as the "cat o' nine tails" and knout were specifically developed for flagellation as a means of inflicting corporal punishment or torture on human targets. Certain religious practices and BDSM activities involve the self-use of whips or the use of whips between consenting partners. Misuse on animals may be considered animal cruelty, and misuse on humans may be viewed as assault.
Whips generally are used on animals to provide directional guidance or to encourage movement. Some whips are designed to control animals by imparting discomfort by tapping or pain by a full-force strike that produces pain compliance. Some whips provide guidance by use of sound, such as cracking of a bullwhip. Other uses of whips are to provide a visual directional cue by extending the reach and visibility of the human arm.
In modern times, the pain stimulus is still used in some animal training, and is permitted in many fields, including most equestrianism disciplines, some of which mandate carrying a whip. The whip can be a vital tool to back up riding aids when applied correctly, particularly when initial commands are ignored. However, many competition governing bodies limit such use of whips, and severe penalties may be in place for over-use of the whip, including disqualification and fines. Overuse improper use of whips may be considered animal cruelty in some jurisdictions.