Time-sensitive items are items that have a limited lifespan and must be used or consumed within a certain period of time. The term 'ephemera' is used to describe these items, which can include things like newspapers, magazines, tickets, and other printed materials. Ephemera is derived from the Greek word 'ephemeros, ' meaning 'lasting only one day.' These items are often considered to be of little value and are not meant to be kept for long periods of time.