Primarily used in the dye and pigment industry, 2-Aminotoluene-5-sulfonic acid serves as a key intermediate in the synthesis of various azo dyes. These dyes are widely applied in textiles, leather, and paper industries for coloring purposes. Additionally, it is utilized in the production of optical brighteners, which enhance the whiteness and brightness of materials like fabrics and plastics. The compound also finds application in organic synthesis, particularly in the preparation of pharmaceuticals and agrochemicals, where it acts as a building block for more complex molecules. Its sulfonic acid group makes it valuable in creating water-soluble compounds, expanding its utility in formulations requiring solubility in aqueous systems.