3-Chloro-4-ethoxyaniline is primarily used as an intermediate in the synthesis of various dyes and pigments. It plays a crucial role in the production of azo dyes, which are widely utilized in the textile industry for coloring fabrics. Additionally, this compound is employed in the development of pharmaceuticals, particularly in the creation of active pharmaceutical ingredients (APIs) that require specific aromatic amine structures. Its chemical properties make it valuable in organic synthesis, where it serves as a building block for more complex molecules used in research and industrial applications.