Sec-butyl bromide is primarily used as an alkylating agent in organic synthesis, where it introduces the sec-butyl group into various molecules. It is commonly employed in the production of pharmaceuticals, agrochemicals, and other fine chemicals. The compound is also utilized in research and development for studying reaction mechanisms and developing new synthetic routes. Additionally, it serves as an intermediate in the manufacture of surfactants and specialty chemicals. Its reactivity makes it valuable in Grignard reactions and nucleophilic substitution processes.