Phosphatidylcholine is a type of phospholipid, a class of molecules that are essential components of cell membranes. It consists of a glycerol backbone, two fatty acid tails, and a phosphate group attached to a choline molecule. This structure helps maintain the integrity and fluidity of cell membranes, allowing cells to function properly. In addition to its role in cell membranes, phosphatidylcholine is important for various biological processes, including fat metabolism and the production of neurotransmitters. It is found in many foods, particularly in egg yolks, soybeans, and sunflower seeds, and is often used as a dietary supplement for its potential health benefits.