Trading blocks are groups of countries that work towards reducing trade barriers between members. The document discusses the major trading blocks: the European Union, NAFTA, OPEC, ASEAN, SAARC, and MERCOSUR. It provides details on the founding, objectives, and provisions of these blocks. The European Union aims to create a common market without trade barriers between its 27 member states. NAFTA eliminated trade barriers between the US, Canada, and Mexico, creating the world's largest free trade area. OPEC coordinates policies to secure fair oil prices for producers and consumers.