The epidermis is the outermost layer of the skin, providing a protective barrier against environmental factors such as bacteria, UV radiation, and dehydration. It is primarily composed of keratinocytes, which produce keratin, a protein that helps strengthen the skin. The epidermis also contains melanocytes, responsible for producing melanin, the pigment that gives skin its color. This layer is relatively thin compared to the deeper layers of skin, such as the dermis and hypodermis. The epidermis is constantly renewing itself, with new cells forming at the base and older cells being shed from the surface. This process helps maintain skin health and resilience.