The Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5), is a manual published by the American Psychiatric Association that provides standardized criteria for the diagnosis and classification of mental disorders.

The DSM-5 includes descriptions of all recognized mental disorders, along with criteria for diagnosis, differential diagnosis, and associated features. The manual is organized into sections based on different categories of mental disorders, including:

1. Neurodevelopmental disorders, such as autism spectrum disorder and intellectual disability
2. Schizophrenia spectrum and other psychotic disorders
3. Bipolar and related disorders
4. Depressive disorders
5. Anxiety disorders
6. Obsessive-compulsive and related disorders
7. Trauma- and stressor-related disorders, such as post-traumatic stress disorder
8. Dissociative disorders
9. Somatic symptom and related disorders
10. Eating disorders
11. Sleep-wake disorders
12. Sexual dysfunctions
13. Gender dysphoria
14. Substance-related and addictive disorders
15. Neurocognitive disorders, such as Alzheimer's disease and traumatic brain injury

The DSM-5 is widely used by mental health professionals, researchers, and insurance companies to diagnose and treat mental disorders. It is also used for research purposes to study the prevalence, causes, and treatment of mental illnesses. However, the DSM-5 has been subject to criticism and controversy, particularly around the validity and reliability of its diagnostic categories.