Diacylglycerol (DAG) is a type of lipid molecule composed of two fatty acid chains attached to a glycerol backbone. It plays a crucial role in cellular signaling and metabolism. DAG is produced in the body during the breakdown of phospholipids and is involved in various biological processes, including the activation of certain enzymes. In addition to its role in signaling, diacylglycerol can also serve as an energy source. It is found in various foods, particularly in oils and fats. Understanding DAG is important in fields like biochemistry and nutrition, as it influences both health and disease.