Pennies are the smallest denomination of currency in the United States, worth one cent. They are made primarily of zinc, with a thin copper coating. The design features the profile of Abraham Lincoln on the front and the Lincoln Memorial on the back. Introduced in 1793, pennies have undergone various design changes over the years. They are often collected by enthusiasts and can be found in circulation, although their use has declined due to the rise of digital payments. Many people consider them less valuable, but they still play a role in everyday transactions.