Fatty acyls, also known as fatty acids, are a class of carboxylic acids derived from the hydrolysis of fats and oils. These compounds play crucial roles in various biological processes, including energy storage, cell signaling, and metabolism. Fatty acyls can be categorized based on their carbon chain length and saturation level into saturated fatty acids (SFAs) and unsaturated fatty acids (UFAs), which further include monounsaturated and polyunsaturated fatty acids. Common types of fatty acyls such as palmitic acid (C16:0), oleic acid (C18:1), linoleic acid (C18:2), and α-linolenic acid (C18:3) are widely used in the food industry for their emollient properties, stability, and nutritional benefits. In cosmetics, fatty acyls enhance skin moisturization and provide a smooth texture to formulations. Additionally, they are utilized in pharmaceutical applications due to their anti-inflammatory and antioxidant effects. These versatile compounds can be isolated from natural sources or synthesized industrially, making them essential components in various products ranging from personal care items to medical treatments.