A custodial sentence is a judicial sentence, imposing a punishment (and hence the resulting punishment itself) consisting of mandatory custody of the convict, either in prison (incarceration) or in some other closed therapeutic and/or (re)educational institution, such as a reformatory, (maximum security) psychiatry or drug detoxication (especially cold turkey). REFORMATORY is : an adjective, from and referring to any connection with reform or reformation, especially (notably when capitalized) to the protestant Reformation a substantive, indicating a juvenile prison where legal minors are sent by (juvenile or general) court to spend a custodial sentence, separate from the bad example of and...

Although usually not labeled as such (at hence not in the legal sense) it can be considered a type of corporal punishment, even if no further physical punishments are practiced within the institution (these can also be informal, without any rights of defense), since it constitutes a physical coercion. Indeed the technical term duress is equally used for loss of liberty and for coercion. Corporal punishment is the deliberate infliction of pain intended as correction or punishment, (corporal means of, relating to, or affecting the body). ...

The concept of penal harm (see that article) often induces additional elements of physical endurance. Penal harm, an intentionally harsher form of the depravation of liberty, is the belief that during custodial sentences (mainly in prison or reformatory), inmates should endure additional pain and suffering, not just having their basic rights taken away, to make the punishment deliberately harder. ...

Every other sentence and punishment is non-custodial, such as fines, judicial beatings, various mandatory but 'open' therapy and courses, restriction orders, loss or suspension of civil rights. In society, punishment is the practice of imposing something unpleasant on a wrongdoer. ...