What is the outermost layer of skin called?

The outermost layer of skin is known as the epidermis. This layer serves as a protective barrier for the underlying layers of skin, preventing moisture loss and shielding the body from environmental elements such as bacteria, pollutants, and UV radiation. The epidermis is primarily composed of keratinocytes, which produce keratin, a protein that aids in skin strength and waterproofing. Additionally, this layer contains melanocytes, which are responsible for the skin's pigmentation and play a role in protecting against UV damage.

The dermis, which lies beneath the epidermis, is thicker and contains connective tissue, hair follicles, and blood vessels. The hypodermis, also known as the subcutaneous layer, is located beneath the dermis and mainly consists of fat and connective tissues that help insulate the body and absorb shock. While these layers are vital to skin structure and function, they do not serve as the outermost protective layer, which is the primary role of the epidermis.