(4-Bromo-2-nitrophenyl)hydrazine is primarily utilized in organic synthesis as a building block for the preparation of more complex chemical compounds. It is often employed in the synthesis of heterocyclic compounds, which are valuable in pharmaceutical research and drug development. The compound serves as a key intermediate in the production of dyes and pigments, particularly in the creation of azo dyes, which are widely used in the textile industry. Additionally, it is involved in the development of analytical reagents for detecting specific chemical substances in laboratory settings. Its role in forming hydrazone derivatives also makes it useful in studying biochemical processes and designing potential therapeutic agents.