Phosphatidic acid is a type of phospholipid, which is a key component of cell membranes. It consists of a glycerol backbone, two fatty acid tails, and a phosphate group. This molecule plays a crucial role in various cellular processes, including membrane structure, signaling, and energy metabolism. In addition to its structural role, phosphatidic acid acts as a signaling molecule that can influence cell growth and differentiation. It is involved in pathways related to cellular signaling and lipid metabolism, making it important for maintaining cellular health and function.