4-Fluorobiphenyl is primarily used in organic synthesis as a building block for more complex chemical compounds. It serves as an intermediate in the production of pharmaceuticals, agrochemicals, and liquid crystals. In the pharmaceutical industry, it is utilized in the development of drugs due to its ability to introduce fluorine atoms into molecules, which can enhance their biological activity and stability. Additionally, it is employed in research and development for studying reaction mechanisms and material properties, particularly in the field of organic electronics. Its role in creating advanced materials makes it valuable for applications in electronics and display technologies.