A first-day cover (FDC) is an envelope or postcard that features a new stamp canceled on its first day of issue. Collectors often seek these items because they commemorate the launch of a stamp, which may celebrate a significant event, person, or theme. The envelope typically includes a design related to the stamp, enhancing its appeal. FDCs are popular among philatelists, who are enthusiasts of philately, the collection and study of stamps. These covers can vary in value based on factors like rarity, condition, and the significance of the stamp. Many collectors enjoy creating themed collections of FDCs to showcase their interests.