JET is a Japanese government program that places English speaking foreigners in public schools throughout Japan, primarily in rural and suburban areas. The purpose of the program encompasses cultural exchange along with language instruction. The department that sponsors JET wants to expose ordinary Japanese citizens to foreigners while also encouraging foreigners to learn first-hand about Japanese culture.
Since actual teaching is only part of the job description, you don’t need teaching experience or certification to qualify for JET. You don’t need to speak any Japanese either. Indeed, for recent college graduates who find themselves with dim job prospects, student loans and a semi-useless liberal arts degree, JET can be an absolute lifesaver.