Postage stamps are sometimes issued in souvenir sheets or miniature sheet containing just one or a small number of stamps. Souvenir sheets typically include additional artwork or information printed on the selvage (border surrounding the stamps). Sometimes the stamps make up part of a greater picture. Some countries, and some issues, are produced as individual stamps as well as in the sheet format.
On the first day of issue a set of stamps can be purchased attached to an envelope that has been postmarked with a special commemorative postmark. Known as a "First Day Cover", it can also be assembled from the component parts by stamp collectors, who are the most frequent users. These envelopes usually bear a commemorative cachet of the subject for which the stamp was created.
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