The Five Dollar Bill is a denomination of United States currency. It features a portrait of Abraham Lincoln, the 16th President of the United States, on the front. The bill is primarily green and has a distinctive design that includes the Lincoln Memorial on the reverse side. Introduced in 1861, the Five Dollar Bill has undergone several design changes over the years. The current version, part of the Federal Reserve Note series, includes security features such as a security thread and a watermark to prevent counterfeiting. It is commonly used in everyday transactions.