Cytidine diphosphate (CDP) is a nucleotide that plays a crucial role in cellular metabolism. It consists of a cytosine base, a ribose sugar, and two phosphate groups. CDP is involved in the synthesis of phospholipids, which are essential components of cell membranes, and it serves as a precursor for the formation of other important biomolecules. In addition to its role in lipid metabolism, CDP is also important in the synthesis of RNA and DNA. It can be converted into cytidine triphosphate (CTP), which is necessary for various biochemical processes, including energy transfer and signaling within cells.