A certificate of good conduct is a certificate issued by the General Intelligence Department. The Department does not require anyone to obtain this certificate, but there are some Arab and foreign embassies and bodies in... Jordan requires obtaining such a certificate as a condition for obtaining visit visas to these countries or requirements for residence or work in them, or otherwise.
(Note that the General Intelligence Department does not collect any fees for issuing good conduct certificates and the required fees (stamps worth 25 piasters and eFawateercom services fees worth 20 piasters))