Collectible coins are typically categorized into various types, including standard currency, commemorative coins, and medals. In the context of the United States, modern commemorative sets, such as those issued in 2020, are produced to honor significant events, people, or places. The Philadelphia and San Francisco mints are known for producing these coins, with each mint offering distinct designs and finishes, including uncirculated and proof versions. Collectors often seek these sets for their historical significance, artistry, and potential for appreciation over time.