Used primarily in the dye industry as an intermediate for the synthesis of azo dyes, which are widely applied in textiles, leather, and paper coloring. It plays a key role in producing vibrant and durable colors due to its sulfonic acid group, which enhances water solubility and dye fixation. Additionally, it is utilized in organic synthesis for creating complex chemical compounds, including pharmaceuticals and agrochemicals, due to its reactive nitro and sulfonic acid functional groups. Its properties make it valuable in research and industrial applications requiring precise chemical modifications.