Benzo[d]isothiazole is primarily used as a key building block in the synthesis of pharmaceuticals and biologically active compounds. Its structure is found in several medicinal agents, particularly in drugs targeting the central nervous system. It serves as a heterocyclic scaffold in the development of antipsychotic and antimicrobial agents due to its favorable electronic and structural properties. The ring system also appears in agrochemicals, where it contributes to the stability and bioavailability of certain pesticides and herbicides. Additionally, derivatives of benzo[d]isothiazole are explored in materials science for their potential use in organic semiconductors and fluorescent dyes, thanks to their conjugated systems and electron-transport characteristics.