This document focuses on the Global Sustainable Tourism Criteria (GSTC) and its importance in promoting sustainable tourism practices. It outlines the principles, origin, and development of the GSTC, emphasizing the necessity of standardized criteria to avoid greenwashing and facilitate genuine certification of sustainable practices in the tourism industry. The document also details the four central themes of the GSTC: sustainable management, socio-economics, cultural heritage, and environment, providing guidelines for tourism stakeholders to enhance sustainability in their businesses.