What term is applied to juvenile actions or conduct in violation of criminal law?

Delinquency is the term applied to juvenile actions or conduct in violation of criminal law. delinquency is criminal behaviour, especially that carried out by a juvenile. Depending on the nation of origin, a juvenile becomes an adult anywhere between the ages of 15 to 18, although the age is sometimes lowered for murder and other serious crimes. 

Ido not understand.