This document discusses various regional trade blocs and agreements. It describes the different levels of economic integration within trade blocs from free trade areas to economic unions. It provides examples of major trade blocs like the European Union (EU), North American Free Trade Agreement (NAFTA), South-South cooperation, the South Asian Preferential Trade Agreement (SAPTA), and the India-Sri Lanka Free Trade Agreement. For each, it summarizes their founding, objectives, provisions, and implications for trade among member countries.