Tourism is defined as the activities, services, and industries that deliver travel experiences. The document discusses various types of tourism including mass tourism versus alternative tourism. It also discusses the different impacts of tourism including economic, socio-cultural, and environmental impacts. Tourism can positively impact economies through foreign exchange earnings and job creation, but it can also cause issues like inflation, seasonality, and leakage of spending outside the local area. Socio-culturally, tourism can help preserve cultural heritage but may also lead to loss of authenticity and commercialization. Environmentally, tourism increases environmental awareness but can damage habitats and wildlife if not managed responsibly.