2-Aminobenzenesulfonic acid is primarily used in the synthesis of azo dyes, which are widely employed in the textile industry for coloring fabrics. It serves as an intermediate in the production of various dyes and pigments, contributing to their vibrant and stable colors. Additionally, it is utilized in the manufacturing of pharmaceuticals, where it acts as a building block for certain active compounds. The chemical is also employed in research and development for creating specialized organic molecules. Its sulfonic acid group makes it valuable in processes requiring water solubility or specific reactivity in organic synthesis.