The epidermis is the outermost layer of the skin, acting as a protective barrier for our bodies. It is made up of several layers of cells that help keep moisture in and harmful substances out. The epidermis also contains cells called keratinocytes, which produce a protein called keratin that strengthens the skin. In addition to protecting us, the epidermis plays a role in sensing the environment. It contains specialized cells known as melanocytes, which produce the pigment melanin that gives skin its color and helps protect against the sun's harmful rays. Overall, the epidermis is essential for maintaining healthy skin.