Agenda 21 is a non-binding UN action plan for sustainable development established at the 1992 Earth Summit in Rio de Janeiro, focusing on social and economic dimensions, conservation, and management of resources. It emphasizes local participation in tourism development, addressing environmental and socio-cultural impacts while benefiting communities. The implementation of local Agenda 21 initiatives has been observed globally, with significant adoption in Europe, promoting sustainable tourism that meets present needs without compromising future opportunities.