Collectible coins, particularly U.S. coins, encompass a variety of types, including commemorative issues, circulating coins, and historic pieces. The 50-cent denomination, known as the Kennedy Half Dollar, was introduced in 1964 to honor President John F. Kennedy following his assassination. The 2007 Kennedy Half Dollar is part of the series that features the iconic profile of Kennedy on the obverse and the presidential seal on the reverse. Collectors often seek specific years, mint marks, and conditions to enhance the value of their collections.