IL-10, or Interleukin-10, is a cytokine, which is a type of protein important for cell signaling in the immune system. It is primarily produced by T cells, B cells, and macrophages, and plays a crucial role in regulating immune responses. IL-10 helps to limit inflammation and prevent excessive immune reactions, promoting a balanced immune response. This cytokine is known for its anti-inflammatory properties, making it essential in controlling autoimmune diseases and chronic inflammatory conditions. By inhibiting the production of pro-inflammatory cytokines, IL-10 helps maintain tissue homeostasis and supports the healing process after injury or infection.