The nigerian prisons service (NPS) is a government agency of nigeria which operates prisons.
The agency is headquartered in abuja and it is under the supervision of the ministry of the interior and the civil defence immigration and prisons board.

See The Functions Of The Nigerian Prison Below;

The identify the causes of their anti-social dispositions
The take into lawful custody all those certified to be so kept by courts of competent jurisdiction
The produce suspects in courts as and when due
The set in motion mechanisms for their treatment and training for eventual reintegration into society as normal law abiding citizens on discharge; and
The administer prisons farms and industries for this purpose and in the process generate revenue for the government.