The G20 (Group of Twenty) is an international forum bringing together the world's largest economies to coordinate on global economic and financial issues. Members include the G7 countries plus major emerging economies (China, India, Brazil, Russia, South Africa, South Korea, Mexico, Indonesia, Australia, Argentina, Saudi Arabia, Turkey) and the European Union. Together, G20 members represent about 85% of global GDP and two-thirds of the world's population. The G20 emerged as a key coordination mechanism during the 2008 financial crisis when broader international cooperation was needed. Leaders meet annually at summits, with supporting ministerial and working group meetings throughout the year. Topics include economic policy coordination, financial regulation, climate change, trade, development, and global health. G20 decisions influence international policies that eventually affect domestic economic conditions and government policies at all levels.