This module provides an introduction to sustainable tourism and the Global Sustainable Tourism Criteria (GSTC). It discusses the origins of sustainable tourism concepts and the events that led to the development of common standards. The GSTC were created by a global partnership to define sustainability standards and prevent "greenwashing" in the tourism industry. The criteria are organized around four themes: sustainable management practices, socio-economic impacts, cultural heritage, and environmental impacts. Exercises are included to help users understand and apply the criteria.