Macrophages are a type of white blood cell that plays a crucial role in the immune system by engulfing and digesting pathogens, dead cells, and other harmful substances. The function of macrophages includes identifying and destroying invading microorganisms, initiating inflammation in response to infection or injury, and helping to facilitate tissue repair and regeneration. Macrophages also play a role in regulating the immune response by presenting antigens to other immune cells and releasing signaling molecules that can either promote or suppress inflammation. Understanding macrophage function is important for developing treatments for a variety of diseases, including infections, autoimmune disorders, and cancer.