4-Chlorobenzyl cyanide is primarily used as an intermediate in the synthesis of various pharmaceuticals and agrochemicals. It plays a crucial role in the production of compounds like antihistamines, anti-inflammatory drugs, and other therapeutic agents. In the agricultural sector, it is utilized in the development of pesticides and herbicides, contributing to crop protection and yield improvement. Additionally, it serves as a building block in organic synthesis for creating complex molecules in research and industrial applications. Its versatility makes it valuable in the manufacture of dyes, fragrances, and other specialty chemicals.