A name that was available yesterday is gone today. Forgetting is the loss of access to information that was once stored in memory. It is a normal and often adaptive feature of a cognitive system that must prioritize.

Causes include decay over time, interference from competing memories, retrieval failure due to missing cues, and motivated forgetting of painful material. The famous forgetting curve described by Ebbinghaus shows rapid initial loss followed by slower decline. Sleep, spaced retrieval, and emotional significance all slow forgetting.

Pathological forgetting appears in amnesia, dementia, and certain dissociative states. In ordinary life, forgetting protects against mental clutter and allows updating of knowledge. Strategies that improve encoding and provide rich retrieval cues reduce unwanted forgetting. The mind is designed to forget as well as to remember.

What disappears from memory often makes room for what still matters.