St Andrew's Cross, also known as the Saltire, is a national flag of Scotland. It features a white diagonal cross on a blue background, symbolizing the crucifixion of Saint Andrew, the patron saint of Scotland. The design is simple yet striking, representing Scotland's rich history and cultural identity. The cross is believed to have originated in the 9th century and was officially adopted as the national flag in 1542. It is often displayed during national celebrations and events, reflecting the pride of the Scottish people. The Saltire is also used in various emblems and insignias associated with Scottish heritage.