Granulocytes are a type of white blood cell that play a crucial role in the immune system. They are characterized by the presence of granules in their cytoplasm, which contain enzymes and other substances that help fight infections. Granulocytes are primarily involved in the body's response to bacteria and fungi, and they can be classified into three main types: neutrophils, eosinophils, and basophils. These cells are produced in the bone marrow and released into the bloodstream, where they circulate and respond to signals from the immune system. When an infection occurs, granulocytes quickly move to the site of infection to help eliminate pathogens. Their rapid response and ability to engulf and destroy invaders make them essential for maintaining health.