The stratum corneum is the outermost layer of the skin, part of the epidermis. It consists of dead skin cells that are tightly packed together, forming a protective barrier. This layer helps to prevent water loss and shields the underlying layers from environmental damage, such as bacteria and pollutants. The stratum corneum is continuously renewed as new cells from the deeper layers of the epidermis rise to the surface. This process, known as keratinization, ensures that the skin remains healthy and resilient. Proper care, including hydration and exfoliation, can help maintain the integrity of this important skin layer.