Final answer:
Insanity is a legal term used to describe a state where an individual is not responsible for their actions due to mental illness or incapacity at the time of a crime.
Step-by-step explanation:
Insanity is primarily a legal term used within the legal system to describe a defendant's inability to understand the wrongfulness of their actions at the time of a crime or to adjudicate their own defense due to mental illness or incapacity. Although the concept does intersect with mental health, the term 'insanity' is not commonly used in contemporary psychological practice or diagnosis. Rather, mental health professionals refer to specific mental health disorders and conditions as defined by the Diagnostic and Statistical Manual of Mental Disorders (DSM).