Punishment (also known as discipline or penalty) is the authoritative imposition of something undesirable or unpleasant on, or the removal of something desirable or pleasant from, a person, animal, organization or entity in response to behavior deemed unacceptable by an individual, group or other entity.[1][2][3][4][5] The authority may be either a group or a single person, and punishment may be carried out formally under a system of law or informally in other kinds of social settings such as within a family.[2] Negative consequences that are not authorized or that are administered without a breach of rules are not considered to be punishment as defined here.[4] The study and practice of the punishment of crimes, particularly as it applies to imprisonment, is called penology, or, often in modern texts, corrections; in this context, the punishment process is euphemistically called "correctional process".[6] Research into punishment often includes similar research into prevention.
Fundamental justifications for punishment include: retribution, deterrence, rehabilitation, and incapacitations such as isolation in order to prevent the wrongdoer's having contact with potential victims.[7] Of the four justifications, only retribution is part of the definition of punishment and none of the other justifications is a guaranteed outcome.[4]
If only some of the conditions included in the definition of punishment are present, descriptions other than "punishment" may be considered more accurate. Inflicting something negative, or unpleasant, on a person or animal, without authority is considered either spite or revenge rather than punishment.[4] In addition, the word "punishment" is used as a metaphor, as when a boxer experiences "punishment" during a fight. In other situations breaking the rules may be rewarded, and is therefore without negative consequences, and so cannot be considered punishment. Finally the condition of breaking (or breaching) the rules must be