Interleukin-6 (IL-6) is a cytokine that plays a crucial role in the immune response and inflammation. It is produced by various cell types, including immune cells, and has multiple functions in the body. IL-6 is involved in the regulation of immune responses, acute phase reactions, and the development of certain diseases such as rheumatoid arthritis, cancer, and cardiovascular disease. Research in the field of IL-6 focuses on understanding its role in health and disease, as well as potential therapeutic strategies targeting this cytokine.