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In page Short-term memory:

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The limited duration of short-term memory (~18 seconds without rehearsal)[1] suggests that its contents spontaneously decay over time.[2][citation needed] The decay assumption is part of many theories of short-term memory. The most notable one is Baddeley's model of working memory. The decay assumption is usually paired with the idea of rapid covert rehearsal: to retain information for longer, information must be periodically repeated or rehearsed, either by articulating it out loud or by mental simulation. Another type of rehearsal that can improve short-term memory is attention-based rehearsal. Information is mentally searched in a particular sequence.[3] Once recalled, the information re-enters short-term memory and is then retained for a further period.