Collecting First Day Covers is a popular aspect of stamp collecting and has a well-developed body of information and resources. One of the most well-known components of First Day Cover collecting are cachets. Cachets are the artwork that is added to the envelope, complementing the stamp subject. In addition to numerous commercial artists and firms that produce cachets, individual collectors will often design their own artwork. Certain cachets are sought after and cachets in general will enhance the value and the collectability of the first day cover.