The G8 meeting is today in Ontario.
The G20 meeting is tomorrow in Toronto.
Originally there were the G5 meetings starting in the 1970s, with the 5 biggest Western democracies: U.S., Japan, Germany, France and Britain.
Then they added Italy and called it G6. Later Canada was added for G7. Finally Russia was added for G8.
G20 adds some newly-developed countries such as China and Brazil.
There's a lot of security in Toronto this week:
http://www.youtube.com/watch?v=2AGA1dCY2qA
