A fatty acid is a type of organic molecule made up of long chains of carbon atoms, usually with hydrogen atoms attached. They are important components of lipids, which are fats and oils found in living organisms. Fatty acids can be saturated, meaning they have no double bonds between carbon atoms, or unsaturated, which means they contain one or more double bonds. Fatty acids play a crucial role in various biological processes, including energy storage and cell membrane structure. They are also involved in signaling pathways and can influence inflammation and metabolism. Common sources of fatty acids include vegetable oils, nuts, and fish.