CERS6, also known as Ceramide Synthase 6, is an enzyme that plays a key role in the biosynthesis of ceramides—essential components of cell membranes and important signaling molecules in cellular processes. Located in the endoplasmic reticulum (ER), CERS6 catalyzes the formation of ceramides by attaching fatty acyl-CoA to sphingoid bases. It is specifically involved in producing ceramide species with distinct acyl chain lengths and saturation, which affect their biophysical properties and cellular functions.