This cluster of papers focuses on the epidemiology, risk factors, and prevention strategies related to suicidal behavior, particularly among adolescents and young adults. It covers topics such as the interpersonal theory of suicide, psychological autopsy studies, non-suicidal self-injury, and the assessment of suicidal behavior. The research also delves into the global patterns of mortality, neurobiology, and the impact of various interventions in mitigating suicide risk.