Young offender institution

Young offender institutions (YOI; more formally His Majesty's Young Offender Institutions or HMYOI; Welsh: Sefydliad Troseddwyr Ifanc Ei Fawrhydi) are youth detention centres for offenders between ages 15 to under 21 in Great Britain. These offenders will have received a custodial sentence following criminal offence convictions or may be being held on remand awaiting trial on pending charges.