What is the purpose of 'milieu' in a mental health care setting?

Milieu refers to the therapeutic environment of a mental health care setting — a structured, safe, and supportive environment intentionally designed to promote clients' treatment, learning of coping skills, and recovery. Milieu therapy uses the physical setting, daily structure, group interactions, and consistent expectations as part of the treatment itself. It is not a medication, test, or document. Understanding the concept of a therapeutic milieu — that the environment and its structure are part of care — is a standard psychosocial concept. (This reflects general concepts; verify specifics against current NCLEX prep materials.)