FA, or Fatty Acid, is a type of carboxylic acid that is an important component of lipids. These molecules are essential for various biological functions, including energy storage, cellular structure, and signaling. Fatty acids can be saturated, meaning they have no double bonds between carbon atoms, or unsaturated, which contain one or more double bonds. In the human diet, fatty acids are crucial for health. They are found in foods like oils, nuts, and fish. The body cannot produce certain fatty acids, known as essential fatty acids, which must be obtained through diet. These include omega-3 and omega-6 fatty acids, vital for brain function and overall well-being.