Philatelists are collectors of postage stamps, envelopes, and related materials. Some other synonyms for philatelists include stamp collectors, philumenists, and numismatists. Stamp collectors collect stamps from all around the world according to their themes, countries, and era. Philumenists collect matchboxes and matchbooks focusing on their designs, advertisement, and cultural significance. Numismatists collect coins, banknotes, and currency. They value currency for its rarity, beauty, and historical value. All these collectors have an interest in preserving the material culture of different time periods, geographic areas, and people. Their collections can be used for historical research, cultural analysis, and personal enjoyment. Overall, these collectors are united by their love for the rare and interesting objects they collect.