Fas ligand is a protein that plays a crucial role in the immune system by regulating cell death, also known as apoptosis. It binds to the Fas receptor on the surface of certain cells, triggering a cascade of signals that lead to the destruction of those cells. This process is essential for maintaining immune balance and eliminating damaged or infected cells. In addition to its role in normal immune function, Fas ligand is involved in various diseases, including autoimmune disorders and cancer. Some cancer cells may exploit this pathway to evade immune detection, making Fas ligand a potential target for therapeutic interventions aimed at enhancing immune responses against tumors.