This document provides an overview of certification for sustainable tourism and ecotourism. It defines key terms like sustainability, sustainable tourism, and ecotourism. Certification is a voluntary process that assesses if a business meets certain standards related to minimizing environmental and social impacts while providing economic benefits. The history and evolution of certification is discussed, from early food and product certification to more recent certification programs for sustainability in tourism. The document explains why certification is important to recognize truly sustainable businesses and guide improvement, and outlines different types of certification programs and how to choose the most appropriate one.