1. The clients are different: black clothes are waiters who provide services for enterprises, yellow clothes are waiters who provide services for schools, and white clothes are waiters who provide services for institutions.
2. Different job contents: Men in black are mainly responsible for the decoration and management of corporate restaurants, nutrition menu planning, corporate activity organization, etc. Yellow clothes are mainly responsible for food procurement, menu design and student meal distribution in school restaurants, while white clothes are mainly responsible for government restaurants' procurement, inventory management and supplier control.