What do directional recruitment, campus recruitment and social recruitment mean respectively?

Campus recruitment refers to recruitment agencies (enterprises, etc.). ) Recruit fresh graduates of all levels and types through various means; Social recruitment is aimed at people with relative work experience; Directional recruitment refers to the recruitment activities in which the recruiter specifies the specific direction or purpose in advance. There are three forms of directional recruitment: ① job orientation, ② conditional orientation and ③ both job orientation and conditional orientation. Campus recruitment and social recruitment are parallel recruitment forms, while directional recruitment overlaps with these two recruitment forms.