What is "shaliah"

A shaliaḥ (; pl. שְלִיחִים, sheliḥim ) or sheliah in Halakha is a Jewish legal emissary or agent. Accordingly, a shaliaḥ performs an act of legal significance for the benefit of the sender, as opposed to him or herself. It is a comparable Hebrew term of the Greek word ἀπόστολος (apostolos, whence the English " apostle").