The primary purpose of the immune response is to defend the body against pathogens, such as bacteria, viruses, and other foreign invaders. The immune system identifies and neutralizes these threats through a coordinated response involving various cells and proteins. This includes the activation of white blood cells, production of antibodies, and the recruitment of specialized proteins called cytokines that communicate between immune cells. A well-functioning immune response is vital for maintaining health, preventing infections, and promoting healing after injuries.