liaison department; public relations department
Refers to a section or division within an organization responsible for external communication, coordination, and relationship management.
He works in the company's liaison department.
Please contact the public relations department.
渉外 is the broader concept of external relations or liaison; 渉外部 is the specific department handling such matters.
Compound of 渉外 (liaison, external relations) and 部 (department, division).