3-Amino-4-hydroxybenzoic acid is primarily used in the synthesis of dyes and pigments, particularly in the production of azo dyes, which are widely applied in the textile industry for coloring fabrics. It also serves as an intermediate in the manufacture of pharmaceuticals, where it is utilized in the development of various medicinal compounds. Additionally, this chemical finds application in organic synthesis, contributing to the creation of complex organic molecules used in research and industrial processes. Its functional groups make it a versatile building block in chemical reactions, enabling the formation of diverse chemical structures.