The Youth Justice Board for England and Wales is an executive non-departmental public body. Its board members are appointed by the Secretary of State for Justice. The YJB oversees the youth justice system in England and Wales, works to prevent offending and reoffending by children and young people under the age of 18 and ensures that custody for them is safe, secure and addresses the causes of their offending behaviour.

Definition from SEND Code of Practice April 2015