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 elimination of those cells. This process is essential for maintaining immune balance and preventing autoimmune diseases. In addition to its role in immune regulation, Fas Ligand is involved in various physiological processes, including tissue homeostasis and the response to infections. Dysregulation of Fas Ligand signaling can contribute to several diseases, including cancer, where it may help tumors evade immune detection.