From Australia to Antigua, Canada to Cameroon, the Commonwealth is a remarkable international organisation, spanning every geographical region, religion and culture. It exists to foster international co-operation and trade links between people all over the world.
The Queen is Sovereign of 15 Commonwealth realms in addition to the UK. She is also Head of the Commonwealth itself, a voluntary association of 53 independent countries.
Find out more about the Commonwealth: www.royal.gov.uk/MonarchAndCommonwealth/Overview.aspx