This report provides a comprehensive overview of the travel and tourism sector, commencing with its historical development, tracing back to ancient times and detailing key periods such as before 1945, 1945-1979, and 1980 to the present day. It explores the structure of the industry, including the Leiper's Model and its components: departing travelers, traveler generating regions, transit route regions, tourist destination regions, and returning travelers, along with the six sectors of the industry, including attractions, transport, accommodation, tour operators, travel agents, and tourism development. The report further analyzes the functions of governments, government-sponsored bodies, and international agencies within the sector and assesses the implications of political change on the travel and tourism sector, using examples from various countries. It also examines factors affecting tourism demand and supply, including how supply has changed at TUI Group to meet demand, and evaluates the positive and negative economic, environmental, and social impacts of tourism, particularly concerning TUI Group businesses, along with strategies to mitigate negative impacts and maximize positive ones.