4-Aminostilbene is primarily utilized in the field of organic synthesis, where it serves as a key intermediate for the production of various dyes and pigments. Its structure allows it to be incorporated into compounds that exhibit strong fluorescence, making it valuable in the development of fluorescent markers used in biological imaging and research. Additionally, it is employed in the synthesis of certain pharmaceuticals, particularly those targeting cancer, due to its ability to interact with biological molecules. Its application extends to materials science, where it is used in the creation of advanced polymers and liquid crystals, contributing to the development of high-performance materials.