# Buffer Memory

<figure><img src="https://662370747-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3VoWwSsyrEg0DEvIIjv9%2Fuploads%2Fgit-blob-a7aa0c6f5af8e1ccb80e26d19c39451127809f6d%2Fimage%20(1)%20(1)%20(3).png?alt=media" alt="" width="299"><figcaption></figcaption></figure>

## Input

| Parameter  | Description                                                                   | Default       |
| ---------- | ----------------------------------------------------------------------------- | ------------- |
| Session Id | An ID to retrieve/store messages. If not specified, a random ID will be used. |               |
| Memory Key | A key used to format messages in prompt template                              | chat\_history |