---
title: Glossary
description: Definitions of terms used across Cloudflare Workers KV documentation.
image: https://developers.cloudflare.com/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/kv/llms.txt  
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# Glossary

Review the definitions for terms used across Cloudflare's KV documentation.

| Term         | Definition                                                                                                                                        |
| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| cacheTtl     | CacheTtl is a parameter that defines the length of time in seconds that a KV result is cached in the global network location it is accessed from. |
| KV namespace | A KV namespace is a key-value database replicated to Cloudflare’s global network. A KV namespace must require a binding and an id.                |
| metadata     | A metadata is a serializable value you append to each KV entry.                                                                                   |

```json
{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/kv/","name":"KV"}},{"@type":"ListItem","position":3,"item":{"@id":"/kv/glossary/","name":"Glossary"}}]}
```