Long-term memory is the stage of the Atkinson–Shiffrin memory model in which informative knowledge is held indefinitely, in contrast to short-term and working memory, which persist for only about 18 to 30 seconds
. Long-term memory refers to the transfer of information from short-term memory into long-term storage in order to create enduring memories
. Long-term memory is consolidated from short-term to long-term memories, primarily in the hippocampus and stored throughout the cortex
. It consists of memories stored over an extended period of time, from an hour ago to decades earlier, and can hold an unlimited amount of information for an indefinite period of time
. Long-term memory can be divided into two types: procedural and declarative. Procedural memory involves activities learned through practice and repetition, while declarative memory includes facts, rules, events, definitions, and experiences that can be consciously recalled
