Information is stored into our long term memory by which the three ways we store memories: First in the sensory stage; then in short-term memory; and ultimately, for some memories, in long-term memory. Important information is gradually transferred from short-term memory into long-term memory. The more the information is repeated or used, the more likely it is to eventually end up in long-term memory, or to be "retained." Unlike sensory and short-term memory, which are limited and decay rapidly, long-term memory can store unlimited amounts of information indefinitely.
