Interreg is a European Territorial Cooperation programme funded by the European Union, aiming to strengthen cooperation between countries, regions, and local authorities in order to address common challenges and promote sustainable development. Through cross-border, transnational, and interregional projects, Interreg supports actions in areas such as environmental protection, circular economy, climate adaptation, innovation, social cohesion, and local and regional development, contributing significantly to the convergence and cohesion of European regions.