Explain the DSM is and how it defines a psychological disord

Explain the DSM is and how it defines a psychological disorder. ***PSYCHOLOGY

Diagnostic and statistical manual (DSM) describes about the mental health disorders. Psychologists differentiate the mental disorders based on the principles of DSM. DSM-V defines the present condition of psychological, biological dysfunction in an individual is due to disturbances in emotional, social, behavioural mental functioning/condition of an individual.