So that means when UV radiation when UV rays actually hit the cells of our skin, they can end up damaging the organelles and the biological molecules such as DNA, found inside our skin cells. And that means excessive UV radiation can damage the skin and ultimately lead to things like cancer. And that's exactly why in the epidermis of our skin we have specialized cells known as melanocytes. And melanocytes release a chemical, a pigment known as melanin. And melanin doesn't only give us our skin color it also actually absorbs some of that UV radiation which protects us from damaging our skin. Now, not only that, but the skin actually creates a physical barrier that does not allow bacterial cells and viral agents to actually get into our body.