Monocytes are a type of white blood cell that plays a key role in the immune system. They are produced in the bone marrow and circulate in the bloodstream, where they can migrate to tissues in response to inflammation or infection. Monocytes can differentiate into macrophages or dendritic cells, which are important in the defense against pathogens and in the regulation of immune responses. Research on monocytes often focuses on their role in various diseases, such as infections, autoimmune disorders, and cancer, as well as their potential as therapeutic targets for these conditions. Additionally, studies on monocytes can provide insights into the mechanisms of immune responses and inflammation.