A borstal was a type of youth detention centre in the United Kingdom, several member states of the Commonwealth and the Republic of Ireland. In India, such a detention centre is known as a borstal school.

In criminal justice systems, a youth detention center, known as a juvenile detention center (JDC), juvenile detention, juvenile jail, juvenile hall, or more colloquially as juvie/juvy or the Juvey Joint, also sometimes referred to as observation home or remand home is a prison for people under the age of majority, to which they have been sentenced and committed for a period of time, or detained on a short-term basis while awaiting trial or placement in a long-term care program. Juveniles go through a separate court system, the juvenile court, which sentences or commits juveniles to a certain program or facility.