Diethyl 4,4'-Biphenyldicarboxylate is primarily used in the field of organic synthesis and materials science. It serves as a key intermediate in the production of liquid crystals, which are essential components in displays for electronic devices such as LCD screens. The compound’s rigid biphenyl structure contributes to the stability and alignment of liquid crystal molecules, enhancing display performance. Additionally, it is utilized in the synthesis of polymers and advanced materials, where its aromatic structure imparts desirable thermal and mechanical properties. Its role in creating high-performance materials makes it valuable in industries focused on electronics, optics, and advanced manufacturing.