Union Jack Flag - Official Flag of the United Kingdom #2216094 (License: Personal Use)

The Union Jack is the de facto national flag of the United Kingdom, formed by superimposing the red cross of St. George (England), the white saltire of St. Andrew (Scotland), and the red saltire of St. Patrick (Ireland). Its distinctive red, white, and navy blue design has remained largely unchanged since 1801, symbolizing the political union of the constituent countries. The flag is used on government buildings, during national events, and internationally to represent British identity and heritage.

This image is commonly used on governmental, educational, travel, and cultural websites to represent the UK; it supports content about British history, citizenship, international relations, or national celebrations like Trooping the Colour or Remembrance Day.