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

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# Glossary

Last updated Apr 21, 2026|Copy as Markdown|[View as Markdown](https://developers.cloudflare.com/kv/glossary/index.md)|[Agent setup](https://developers.cloudflare.com/agent-setup/)

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.                                                                                   |

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