Collectible coins are often categorized into various types based on their historical significance, design, and rarity. In the context of the United States, coins such as the 2022 Dollar series can be found in rolls, which typically contain a set number of coins, like 25. These coins may feature unique designs commemorating specific events or individuals and are sought after by both numismatists and investors. Collectible coins often hold value beyond their face value due to demand, scarcity, and their condition.