A $0.25 coin, commonly known as a quarter, is a unit of currency in the United States. It is worth one-fourth of a dollar and is made primarily of a mixture of copper and nickel. The quarter features the profile of George Washington on the front and various designs on the back, which can change to honor different states or national parks. The quarter is widely used in everyday transactions, such as buying snacks or paying for parking. It is also a popular coin for collectors, with some quarters being more valuable due to their rarity or unique designs.