The British flag is commonly known as the "Union Flag", its official name is "the Union Flag", and it is also often called "the Union Jack". Jack is a naval term that refers to the flag hung on the bow of the ship. British warships fly the national flag in the capital, hence the name. Union Flag means "Union Flag". It is a red and white rice flag with a dark blue background. This flag is a combination of the red cross on a white background of England, the white cross on a blue background of Scotland, and the red cross on a white background of Ireland. Later, part of the island of Ireland broke away from the United Kingdom, and the flag did not change again. There is no image of the Welsh region on the flag because when it was designed, Wales had already merged with England. The crosses on the Union Jack represent Saint George, patron saint of England, Saint Andrew, patron saint of Scotland, and Saint Patrick, patron saint of Ireland.

The white background red cross flag of St. George of England was produced in 1200 and was later adopted as the national flag of England. The blue and white "X"-shaped cross flag of St. Andrew of Scotland first appeared in the 8th century, but was not officially used as the national flag of Scotland until the 13th century. In 1606, when James I unified England and Scotland, he overlapped the two flags as the national flag of Great Britain. The British flag dates back to 1606. In 1603, England and Scotland had the same king, James I in England and James VI in Scotland.

The national flag established on April 12, 1606, was a cross-merging of the St. George's Cross flag of England and the St. Andrew flag of Scotland, but it was a little different from today's flag in that there was no red slash ( so-called St. Patrick's Cross).

The red "x"-shaped cross flag on a white ground of St. Patrick of Ireland was first the flag of the Fitznold family of Ireland; in 1801, after Ireland and Great Britain united to form the Kingdom, this flag was combined with the flag of Great Britain. Overlapping, finally forming the strangely composed "Union Flag" of the United Kingdom of Great Britain and Northern Ireland.

Reference link: British flag_Baidu Encyclopedia

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