Memory involves the retention and recall of information and experiences. The hippocampus, amygdala, and cerebral cortex play key roles in memory processing and storage. There are different types of memory including short-term memory, long-term memory, sensory memory, declarative memory, and procedural memory. Methods for improving memory include recall, recognition, relearning, brain exercises, managing stress, good sleep, and not smoking. Aging can impact memory through changes in the hippocampus and loss of neurons and brain function over time. Forgetting and amnesia can result from brain damage or injury.