The flag of the United Kingdom, also known as the Union Jack, consists of a blue field with the crosses of St. George, St. Andrew, and St. Patrick superimposed on each other. The cross of St. George, which represents England, is a red cross on a white background. The cross of St. Andrew, which represents Scotland, is a white diagonal cross on a blue background. The cross of St. Patrick, which represents Ireland, is a red diagonal cross on a white background. The Union Jack flag was adopted on January 1, 1801, and has since become a symbol of the United Kingdom’s rich history and cultural heritage.