Sustainability principles refer to the environmental, economic, and socio-cultural aspects of tourism development, and a suitable balance must be established between these three dimensions to guarantee its long-term sustainability.

Responsible tourism is built on three core "pillars" often referred to as the Triple Bottom Line: Economic, Social, and Environmental. First, the Economic principle ensures that tourism revenue stays within the local community by supporting locally owned businesses and providing fair wages. Second, the Social (or Cultural) principle focuses on respecting the local culture, preserving heritage sites, and ensuring that tourism does not disrupt the daily lives of residents. Third, the Environmental principle aims to minimize the "ecological footprint" of travel by reducing waste, conserving water, and protecting local wildlife and ecosystems. The overarching goal of these principles is to create a "net positive" effect, where the destination is actually improved or preserved by the presence of travelers, rather than being degraded by over-tourism or commercial exploitation.