transitory written or printed matter
which are meant to be thrown away after one use or
not intended to be retained or preserved.
Ephemera (ἐφήμερα) is a noun, the plural neuter of ephemeron and ephemeros, Latin for ἐπί - epi "on, for" and ἡμέρα - hemera "day" with the ancient sense extending to the mayfly and other short lived insects and flowers and for something which lasts a day or a short period of time.
Museum and national libraries may collect, organize and preserve ephemera as history.