HM Prison Service is a government agency in the United Kingdom responsible for managing prisons and young offender institutions. Its primary role is to ensure the safe and secure custody of individuals sentenced to imprisonment, while also providing rehabilitation programs to help reduce reoffending rates. The service operates under the Ministry of Justice and oversees various facilities across England and Wales. It aims to maintain order and safety within prisons, support inmates in their rehabilitation, and prepare them for reintegration into society upon release.