What do you call a person who supplies the food drinks etc. for a function?

A person who supplies food, drinks, and other necessities for a function is commonly referred to as a caterer. Caterers can provide a range of services, from simple food delivery to full-service catering, which includes setup, serving, and cleanup. In some contexts, this role may also be fulfilled by an event planner or coordinator who handles all aspects of the event, including catering.