The "Ten-Dollar Bill" is a denomination of United States currency. It features a portrait of Alexander Hamilton, one of the Founding Fathers and the first Secretary of the Treasury. The bill is primarily blue and green, with various security features to prevent counterfeiting. The current design of the ten-dollar bill was introduced in 2006, incorporating advanced technology for enhanced security. It includes elements like a security thread and a watermark. The bill is commonly used in everyday transactions and is an important part of the U.S. monetary system.