Food incorporates a diverse array of nutrients, some of which are deliberately added for functional purposes, while others occur naturally in certain food items. When these compounds are present in processed foods, they are categorized as “food additives.” Regulatory oversight stipulates that each food additive must demonstrate a beneficial and justifiable function to validate its inclusion. Food additives are commonly utilized to achieve desirable objectives, including improved food preservation, elevated nutritional value, augmentation of functional attributes, facilitation of processing, and heightened consumer appeal. Regulatory frameworks strictly prohibit the use of food additives to deceive consumers or conceal food damage or deterioration. Moreover, the application of food additives is proscribed in circumstances where cost-effective, high-quality production methods can yield equivalent outcomes. Furthermore, the burgeoning awareness of the health benefits offered by specific dietary constituents has led to the commercial introduction of a wide spectrum of innovative food additives. Notably, many food additives have natural counterparts, and the commercial production of novel compounds utilizing natural resources continues to expand. This chapter furnishes an integrated perspective on the functionalities of food additives, centering on an exploration of their function and chemical properties within the realm of food.