Agent memory is information an AI agent saves so it can use it in a later conversation or task. For example, an agent might keep a project note or remember a preference instead of asking you again each time.
It is a little like writing something on a note and putting it in a drawer for later. Memory is different from what the agent can currently see in its conversation. Saved details can become outdated or be misunderstood, so important information should be checked and updated.