Macrophages are a type of white blood cell that play a crucial role in our immune system. They act like the body's cleanup crew, identifying and engulfing harmful invaders such as bacteria and viruses. By doing this, macrophages help protect our body from infections and diseases. They also remove dead cells and debris, keeping our tissues healthy. In addition to their cleaning duties, macrophages are important for signaling other immune cells. They release chemicals that alert the body to potential threats, helping to coordinate a stronger immune response. This makes macrophages essential for maintaining overall health and fighting off illnesses like influenza and COVID-19.