Tourism is a rapidly growing global industry that provides over 250 million jobs and generates over $900 billion in income annually. It is the main source of income for 80% of the world's countries. The growth of tourism is due to factors such as increased disposable income, more paid time off from work, faster travel, greater car ownership, longer lifespans, and easier online booking. While tourism provides employment and economic benefits, it can also damage the environment, disrupt local cultures, and leave destinations vulnerable to external economic and political factors.