Monocytes are a type of white blood cell that play a crucial role in the immune system. They are produced in the bone marrow and circulate in the bloodstream, where they help to identify and eliminate pathogens like bacteria and viruses. When they encounter an infection, monocytes can move into tissues and transform into macrophages or dendritic cells, which are essential for engulfing and digesting harmful invaders. These cells are also important for inflammation and tissue repair. By releasing signaling molecules called cytokines, monocytes help coordinate the immune response and promote healing. Their ability to adapt and respond to various threats makes them vital for maintaining overall health and fighting diseases.