Synopsis In the complex world of international trade, to sustain the competition from developed countries and to achieve competitive and strategic benefits, developing countries are resorting to trade alliances among themselves, which make them combat the hegemonic powers with a collective strength. During the dawn of the twentieth century and after the world wars, many regional economic blocs have been formed to promote trade among nations. Trade blocs come in different forms - free trade areas, common markets, customs unions and economic union. Some of the common trade blocs are NAFTA, ASEAN, SAARC, AU, Agadir, EU, CARICOM, EFTA, GCC, PARTA and Unasur. Trade blocs have become very important for the economic development of not only the member-countries but also for the overall development of the region. Trade blocs have become major nerve centers for economic progress. While the benefits are enormous, there are also many articles which talk about the negative side of trade blocs. In a larger perspective they also seem as hindrances to WTO where nations are abandoning WTO and are pursuing regional blocs. The present book focuses on types of trade blocs, history, evolution, advantages and disadvantages, success factors, failure reasons, trade blocs and WTO and some popular trade blocs.