The Diagnostic and Statistical Manual of Mental Disorders (DSM) is a comprehensive guide used by mental health professionals to diagnose and classify mental disorders. Published by the American Psychiatric Association, it provides standardized criteria and descriptions for various mental health conditions, helping clinicians make accurate diagnoses. The DSM is regularly updated to reflect new research and changes in understanding of mental health. Each edition includes detailed information about symptoms, prevalence, and risk factors associated with different disorders, making it a crucial resource for effective treatment and research in the field of psychology and psychiatry.