Loosely, a group of 8 industrialised countries comprising Canada, France, Germany, Italy, Japan, Russia, the United Kingdom and the United States. The European Union is also represented.
More strictly, a meeting of the heads of government from those countries.
Also known as the 'Group of Eight' or 'G8'.
Suspension of Russia
Meetings of the G8 were suspended in March 2014 due to Russian involvement in Crimea. Subsequently, the member countries of the G8, excluding Russia, have met as the G7.