Restraints are devices used to limit a patient's movement and are sometimes necessary to prevent harm. There are three main types of restraints: physical, mechanical, and chemical/pharmacological. Physical restraints include items like mittens, vests, and bed rails. Mechanical restraints use devices attached to the body to restrict movement, while chemical restraints involve medications to sedate or subdue patients. Restraints aim to restrict movement only as needed and should be removed regularly to prevent side effects like pressure ulcers, decreased mobility, or agitation. Nurses must closely monitor restrained patients and have a doctor's order, consent, and document use according to guidelines to safely use restraints.