This document provides an overview of trauma and trauma-informed care, with a focus on applications for the juvenile justice system. It discusses what trauma is, prevalence rates, the impact of trauma on child development, and principles of trauma-informed care including relationships, physical environment, policies and procedures, and attitudes/beliefs. It also covers topics like adverse childhood experiences, gender differences in trauma, the "code of the street" theory of violence and victimization, and the relationship between past victimization and future offending among youth.