United Kingdom itself is considered a sovereign country, it comprises four different countries

The four countries that make up the United Kingdom are England, Scotland, Wales, and Northern Ireland

All of the countries that make up the United Kingdom have their own cultures, traditions, identities, and different accents

London is both the capital of England as well as the capital of the United Kingdom. Edinburgh is the capital of Scotland

Cardiff is the capital of Wales, and Belfast is the capital of Northern Ireland. Even though only these countries make up the United Kingdom

Great Britain refers to the island that consists of the countries of England, Scotland, and Wales. It separates the United Kingdom from the European mainland

Northern Ireland is not considered to be a part of Great Britain because it is not located on the island of Great Britain, rather it is located on the island of Ireland

Another important thing to note is that the country of Northern Ireland should not be confused with the Republic of Ireland