Globalization refers to the integration of economies, societies and cultures through communication and trade. It is driven by economic, technological, social and political factors. Three key channels of globalization are international trade, movement of capital, and flow of finance. India embraced globalization in 1991 by opening its economy to foreign investment and trade. While globalization has benefits like increased trade and access to goods, it also has negative effects such as increased income disparity and the spread of diseases. Trading blocks reduce trade barriers between member countries and come in different forms like customs unions, common markets and free trade areas. Examples include the EU, ASEAN and NAFTA.