Why do scientist use binomial nomenclature instead of common names ?

Binomial nomenclature is the formal and accepted naming system used by scientists for naming living organisms. Scientists use binomial nomenclature instead of common names because binomial nomenclature gives distinct (noticeably different) names to a species in a genus. Binomial nomenclature provides every species with a two-part scientific name. The first name is the genus; the name of the small closely related group in which the organism belong to, while the second name is the specific epithet that helps to differentiate and identify a certain species from others that belongs to the same genus.