The Union Jack

The Union Flag, commonly known as the "Union Jack", is made up of three other flags. It is the flag of the United Kingdom of Great Britain and Northern Ireland, and symbolises the administrative union of the countries that are part of the United Kingdom (England, Wales, Scotland and Northen Ireland).

So can you guess which flags together form the Union Jack?

The cross of St. George, that is the national flag of England.

The cross of St. Andrew, that is the national flag of Scotland.

The cross of St. Patrick, that represents Northern Ireland.

But then, how is Wales represented in the Union Jack? As Wales was not a Kingdom, but a Principality it could not be included on the flag. 

Here you have the national flag of Wales.