The groups that need a chef's certificate include professional chefs, student chefs, freelance chefs, catering enterprise operators and cooking trainers. Chef's certificate is a kind of professional qualification certificate, which usually needs to be trained in relevant institutions or schools and passed the exam. The following are some groups that need chef certificates:

1. Professional chefs: chefs who work in restaurants, hotels, canteens and other catering industries.

2. Student chef: a student who studies as a chef in a catering school or a hotel management school.

3. Freelance chef: a person who provides chef services as a self-employed or contract worker.

4. catering enterprise operators: when operating restaurants, hotels and other catering places, holding a chef's license can improve the professional quality and credibility of management.

5. Cooking trainer: A teacher or lecturer who is engaged in cooking training can increase the authority and credibility of teaching by holding a chef's certificate.