Collectible coins include a variety of types such as commemorative coins, bullion coins, and proof coins. The Kennedy Half Dollar, first issued in 1964, is a notable 50-cent coin in the United States, celebrating President John F. Kennedy's legacy. The 2023 Kennedy Half Dollar features updated designs and can be found in various conditions, including circulated, uncirculated, and proof versions, making it appealing to numismatists and collectors.