---
title: Concepts
description: Core concepts for Cloudflare Challenges, including clearance cookies and how challenges work.
image: https://developers.cloudflare.com/core-services-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/cloudflare-challenges/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# Concepts

Refer to the following pages for more information on how challenges work:

* [ How Challenges work ](https://developers.cloudflare.com/cloudflare-challenges/concepts/how-challenges-work/)
* [ Clearance ](https://developers.cloudflare.com/cloudflare-challenges/concepts/clearance/)

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