The web facilitates tourism Introduction The tourism sector was one of the first business sectors to take advantage of the possibilities of the Internet for the provision of tourism services. In this study there will be an attempt to approach and present the basic functions and architecture of a standard travel agency system on the Internet. The Internet and Its Importance in the Tourism Sector The tourism sector is one of the most important business sectors in Greece. One of the tourism service providers is the travel agency, which is also the main intermediary between the providers of basic tourism services and the final consumers. A travel agency, for example, is an intermediary agent acting on behalf of the client, making arrangements with tourism providers, airlines, hotels, travel guides, etc. The term “online travel agency” refers to the transfer to the Internet of all or part of the tourism services offered by a real travel...