The document discusses different styles of food service, including formal waiter service, self-service, vending, and contract catering. Formal waiter service is the most sophisticated style seen in banquet settings and dining hosted by heads of state. Self-service allows customers to serve themselves at counters or buffets and provides informality and customer choice. Contract catering involves caterers specializing in specific types of food service and production. The various service styles each have different impacts on customer turnover rates and satisfaction. Food display design is also important to maximize sales and minimize health risks.