职工 (zhígōng) refers to staff or workers in an organization, emphasizing their employment status. It is broader than 工人 (gōngrén 'manual worker') and more formal than 员工 (yuángōng 'employee'), which is the everyday term for any employee. 职员 (zhíyuán) specifically means an office worker, while 人员 (rényuán) is a general collective term for 'personnel'.