The British Flag, commonly known as the Union Jack, is the national flag of the United Kingdom. It combines the crosses of three patron saints: St. George for England, St. Andrew for Scotland, and St. Patrick for Ireland. The flag features a blue field with a red cross edged in white, overlaid with a diagonal red and white cross. The design symbolizes the unity of these nations under one flag. The Union Jack is often used in various contexts, including government buildings, military insignia, and sporting events, representing British identity and heritage worldwide.