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.

A prison, also known as a jail, gaol, penitentiary, detention center, correction center, correctional facility, or remand center, is a facility where people are confined against their will and denied a variety of freedoms under the authority of the state, generally as punishment for various crimes. Authorities most commonly use prisons within a criminal-justice system: people charged with crimes may be imprisoned until their trial; those who have pled or been found guilty of crimes at trial may be sentenced to a specified period of imprisonment.