What is Ephemera [Publication Type]?

Transient everyday items, usually printed on paper, that are produced for a specific limited use and then often thrown away. Similar material of the past has acquired literary or historical significance. The word comes from the Greek ephemeros, lasting only a day. (From Genre Terms: A Thesaurus for Use in Rare Book and Special Collections Cataloguing, 2d ed & The ALA Glossary of Library and Information Science, 1983)