Short-term memory is the memory of the present, used as working or temporary memory.
Information is retained in STM automatically and is retrieved without effort.
However, the amount of information in STM is severely limited: 7 ?2 items.
STM is extremely fragile - the slightest distraction and its contents are gone. For example, STM can hold a seven digit phone number from the time you look it up until the time you use it, as long as no distractions occur.