Interleukin-1 beta (IL-1β) is a type of protein known as a cytokine, which plays a crucial role in the immune system. It is produced mainly by macrophages and is involved in the inflammatory response. IL-1β helps to regulate various immune functions, including the activation of T cells and the production of other cytokines. This cytokine is important for fighting infections and healing injuries, but excessive levels can lead to chronic inflammation and contribute to diseases such as rheumatoid arthritis and type 2 diabetes. Understanding IL-1β is essential for developing treatments for these inflammatory conditions.