This thesis will investigate the impact of global tourism on local cultures and economies, focusing on popular tourist destinations in both developed and developing countries. Analyze the positive effects of tourism, such as job creation and economic growth, as well as the negative impacts, including cultural erosion, over-tourism, and environmental degradation. Use case studies of regions like Bali, Venice, and the Maldives to illustrate the varied effects of tourism on local communities. The thesis should propose sustainable tourism practices that balance economic benefits with cultural and environmental preservation.