England, Wales, and Scotland considered as a unit. The name is also often used loosely to refer to the United Kingdom.
Great Britain is the name for the island that comprises England, Scotland, and Wales, although the term is also used loosely to refer to the United Kingdom. The United Kingdom is a political unit that includes these countries and Northern Ireland. The British Isles is a geographical term that refers to the United Kingdom, Ireland, and surrounding smaller islands such as the Hebrides and the Channel Islands