Short-term memory (or "primary" or "active
memory") is the capacity for holding a small amount of
information in
mind in an active, readily available state for a short period of time. The duration of short-term memory (when rehearsal or active maintenance is prevented) is believed to be in the order of seconds. A commonly cited capacity is
The Magical Number Seven, Plus or Minus Two (which is frequently referred to as
Miller's Law.) In contrast,
long-term memory can hold an indefinite amount of information. Short-term memory should be distinguished from
working memory, which refers to structures and processes used for temporarily storing and manipulating information (see details below).