A neutrophil is a type of white blood cell that plays an important role in the immune system. The term comes from the Greek words “neutros” (meaning neutral) and “philein” (meaning to love), referring to their ability to recognize and attack foreign substances without harming healthy cells. Neutrophils are part of the body's defense against infection, as they can engulf and destroy bacteria, fungi, and other pathogens through a process called phagocytosis. They also release enzymes that break down microbes and toxins, and produce antimicrobial proteins that help neutralize or kill invading organisms.