Harmful microorganisms, commonly referred to as germs, are microscopic organisms that can cause disease and illness in humans. These germs can be found in many places, including on surfaces, in food, and in the air. They can be spread through contact with an infected person or object, or through contact with contaminated food or water. Some of the most common harmful microorganisms include bacteria, viruses, fungi, and parasites. These germs can cause a variety of illnesses, ranging from mild to severe, depending on the type of GERM and the person's health.