Demon
The contemporary Roman Catholic Church unequivocally teaches that angels and demons are real beings rather than just symbolic devices. The Catholic Church has a cadre of officially sanctioned exorcists which perform many exorcisms each year. The exorcists of the Catholic Church teach that demons attack humans continually but that afflicted persons can be effectively healed and protected either by the formal rite of exorcism, authorized to be performed only by bishops and those they designate, or by prayers of deliverance, which any Christian can offer for themselves or others.
Exorcist
The office of Exorcist was not a part of the sacrament of Holy Orders but as a sacramental was instead first conferred on those who had the special charism to perform its duties and later to those studying for the priesthood. By the twentieth century, the order had become purely ceremonial. As a minor order, exorcists wore the surplice.