Travel and Tourism one of the world's largest foreign exchange earner among industries, provides employment directly to millions of people worldwide and indirectly through many associated service industries. A very wide industry, it includes Government tourism departments, Immigration and customs services, travel agencies, airlines, tour operators, hotels etc and many associated service industries such as airline catering or laundry services, Guides, Interpreters, Tourism promotion and sales etc. Travel and Tourism enterprises include major internationals with a workforce of thousands, to the small private travel agent with a handful of employees.