A tour operator is a business that plans and operates tours for customers. They are responsible for booking travel and accommodations, planning activities and itineraries, and ensuring customer safety and tour success. There are different types of tour operators based on their target markets, geographical areas served, and business models, including mass market, specialist, outbound, inbound, domestic, direct sell, retail, and wholesale operators. Tour operators must be well-organized, network well, use technology, be knowledgeable about destinations, and have friendly, enthusiastic attitudes. They rely on reference materials like maps, calendars, brochures, souvenirs, and promotion materials at different stages of organizing a tour.