Aim is to keep those sentences to prision in custody & help them lead law-abiding, useful lives whilst in prison. Work with police, councils and charities to do this.
Funding comes from govenment through taxation.
Most prisons are public sector & run by govenment. However, there are 14 private prisons run by private security companies.
Prisons divided into 4 levels: Category A - Category D. Category A is high risk, maximum security, though to Cat D: low risk/open prisions.