Jail or prison is a placed where people who break the law are confined. The U.S. has more people in jails than any other country.
In the United States penal system, a jail is a correctional institution used to detain persons who are in the lawful custody of the state, including accused persons awaiting trial and those who have been convicted of a crime and are serving a sentence of less than one year. Jails are generally small penitentiaries run by individual counties and cities, though some jails in larger communities may be as large and hold as many inmates as regular prisons. As with prisons, some jails have different wings for certain types of offenders, and have work programs for inmates who demonstrate good behavior. Jails are typically operated by city or county governments, and house prisoners who are being detained before trial or serving sentences less than one year. Approximately half of the U.S. jail population consists of pretrial detainees who have not been convicted or sentenced.