The international organization known for promoting political and economic cooperation among member countries is the Organisation for Economic Co-operation and Development (OECD). Established in 1961, the OECD focuses on improving economic performance and social welfare through collaboration on various issues like trade, education, and environmental sustainability. By providing a platform for discussion and policy analysis, the OECD helps member countries identify best practices and coordinate policies that promote sustainable economic growth. Additionally, the organization fosters international dialogue and cooperation, strengthening ties between developed and emerging economies.