Canada is a constitutional monarchy as well as a Commonwealth Realm, with Queen Elizabeth II as our reigning monarch, since February 6, 1952. As such she is Canada's head of state and officially called Queen of Canada.
As Head of State, The Queen undertakes constitutional and representational duties which have developed over hundreds of years. In addition to these State duties, The Queen has a less formal role as 'Head of Nation'. She acts as a focus for national identity, unity and pride; gives a sense of stability and continuity; officially recognises success and excellence; and supports the ideal of public and voluntary service.