Skin is a flexible, waterproof covering that protects us from the outside world. It prevents harmful germs from entering the body. Skin is your largest organ and it is sensitive to touch, temperature and pain. Your skin tells you what is happening around your body, so you can avoid injuring yourself. It also helps to prevent damage from the sun’s harmful ultraviolet rays. Finally skin helps to regulated body temperature by sweating and flushing to lose heat when you get too hot.