Collectible coins include various types such as commemorative coins, which are often issued to honor notable events, people, or places. The United States Mint produces a range of collectible coins, including modern commemorative sets like those released in 2015. These sets may feature distinctive designs and are produced in limited quantities, appealing to both collectors and investors. The 2015 modern commemorative sets included themes celebrating specific anniversaries or achievements, further enhancing their collectible value.