---
description: Core caching concepts including TTL, revalidation, and cache control.
title: Concepts
image: https://developers.cloudflare.com/og-docs.png
---

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# Concepts

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

Review the following topics to learn more about the basic concepts and components of Cloudflare Cache.

* [CDN-Cache-Control](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/cdn-cache-control/)
* [Cloudflare cache responses](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/cache-responses/)
* [Customize cache](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/customize-cache/)
* [Default cache behavior](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/default-cache-behavior/)
* [Head Requests and Set-Cookie Headers](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/cache-behavior/)
* [Origin Cache Control](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/cache-control/)
* [Retention vs Freshness (TTL)](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/retention-vs-freshness/)
* [Revalidation](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/revalidation/)
* [Vary](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/cache/concepts/vary/)

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