Final answer:
The epidermis is the most superficial layer of the skin which acts as a protective barrier for the body and is part of the integumentary system.
Step-by-step explanation:
The most superficial layer of the skin that covers almost the entire body and protects the deeper layers of skin is known as the epidermis. The integumentary system, consisting of the skin, hair, nails, exocrine glands, and sensory nerves, has many functions including providing a protective covering for the body, sensing the environment, and helping the body maintain homeostasis.
The epidermis serves as a barrier that protects against injury, pathogens, UV light exposure, and water loss. Meanwhile, the dermis is found beneath the epidermis, and the hypodermis (also known as the subcutaneous layer) is the deeper tissue below the dermis.