Maximum security prisons and

supermax prison A super-maximum security (supermax) or administrative maximum (ADX) prison is a "control-unit" prison, or a unit within prisons, which represents the most secure level of custody in the prison systems of certain countries. The objective is to ...

s are grades of high security level used by

prison A prison, also known as a jail, gaol, penitentiary, detention center, correction center, correctional facility, or remand center, is a facility where Prisoner, people are Imprisonment, imprisoned under the authority of the State (polity), state ...

systems in various countries, which pose a higher level of

security Security is protection from, or resilience against, potential harm (or other unwanted coercion). Beneficiaries (technically referents) of security may be persons and social groups, objects and institutions, ecosystems, or any other entity or ...

to prevent prisoners from escaping and/or doing harm to other inmates or security guards. *For the United States, see Incarceration in the United States § Security levels *For Canada, see Correctional Service of Canada § Security classification of offenders *For other prison systems, see Prison § Security levels

See also