Commercial catering provides food and beverage services with the primary goal of earning profits. There are two types of commercial catering: general market catering which serves the public equally, and restricted market catering which only serves specified groups like members or employees. General market catering includes establishments like hotels, restaurants, bars, and pubs while restricted market catering includes transport, clubs, institutional, and industrial catering. The document provides examples of different types of establishments under each category of commercial catering.