Discuss the historical evolution of tourism development.

Ancient Tourism: In BC, ancient civilizations such as ancient Egypt, ancient Greece and ancient Rome appeared tourism activities for the purpose of religion, pilgrimage and exploration, which made contributions to economic development, cultural exchange and scientific and technological progress.

18th century to the beginning of 20th century: With the progress of industrial revolution and transportation technology, tourism has gradually become a popular activity. Tourists in this period mainly came from the wealthy classes in Europe, and they traveled around the world for the main purpose of exploration, academic research and cultural inspection.

Mid-20th century: With the development of global economy and the improvement of traffic conditions, tourism expanded rapidly. During this period, tourists were no longer confined to the wealthy class, and ordinary people began to join the ranks of tourists. Tourism destinations have also expanded from the original famous cultural heritage sites to natural scenery, seaside resorts and other fields.

Since the end of the 20th century, tourism has become one of the most dynamic and potential industries in the world. The rapid development of global tourism has prompted governments to regard tourism as an important pillar industry of economic development. At this stage, tourism presents the characteristics of diversification, individualization and high competition. At the same time, the impact of tourism on the environment, society and economy has aroused widespread concern, and sustainable tourism has become the core concept of tourism development in the world today.