The Union Jack or Union Flag is the national flag of the United Kingdom.
The flag consists of the red cross of Saint George (the patron saint of England), edged in white, superimposed on the red saltire of Saint Patrick (the patron saint of Ireland), also edged in white, superimposed on the saltire of Saint Andrew (the patron saint of Scotland). Wales is not represented in the flag because the earlier flag of Great Britain was designed while Wales was part of the Kingdom of England.
The origins of the flag date to the earlier flag of Great Britain which was established in 1606 by a proclamation of King James VI and I of Scotland and England.