What is a "macrophage"?

A macrophage is an essential immune cell in the human body that engulfs and eliminates foreign invaders, such as bacteria and viruses, as well as dead cells and debris. They are part of the innate immune system and play a critical role in immune response, inflammation, tissue repair, and regulation of the immune system. Macrophages can be found in various tissues and organs throughout the body, acting as first responders to maintain health and protect against infections.