This day is Commonwealth Day, and is celebrated every year by 53 Commonwealth countries. The aim of commemorating Commonwealth Day is to promote understanding of global issues, international co-operation and the work of the Commonwealth of Nations to improve the lives of its citizens. 2019 also marks the 70th anniversary of the formation of the Commonwealth as it is configured today, with old ties and new links enabling co-operation towards social, political and economic development, which is both inclusive and sustainable.