2-Methylindole-4-carboxaldehyde is primarily used in the synthesis of organic compounds, particularly in the development of pharmaceuticals and agrochemicals. It serves as a key intermediate in the production of various heterocyclic compounds, which are essential in drug discovery and development. Its structure is valuable in creating molecules with potential biological activity, such as anti-inflammatory, antimicrobial, or anticancer properties. Additionally, it is utilized in the synthesis of dyes and pigments due to its ability to form complex structures with unique color properties. In research, it is often employed as a building block for constructing more complex organic molecules, aiding in the study of chemical reactions and material properties.