A phosphate salt is a chemical compound that comprises phosphate ions and their related anions. 

In food applications, phosphates serve as emulsifiers, thickeners, stabilizers, and leavening agents. Additionally, they act as preservatives by retaining moisture, inhibiting fat oxidation, and regulating pH levels, thereby extending shelf life and improving texture, flavor, and appearance. Phosphates are invariably employed in processed meats, dairy items like processed cheese, baked products, and soft beverages.

Phosphate can be also used in fertilizers, cosmetics, animal feed and electronics.