Coenzyme A, often abbreviated as CoA, is a vital molecule found in all living cells. It plays a crucial role in the metabolism of fatty acids and carbohydrates by acting as a carrier for acyl groups. This means it helps transport and activate these molecules for energy production and synthesis of important compounds. CoA is synthesized from the vitamin pantothenic acid and is essential for the function of various enzymes, particularly those involved in the Krebs cycle and the synthesis of cholesterol. Its ability to form thioester bonds allows it to participate in numerous biochemical reactions, making it indispensable for cellular energy metabolism.