---
title: Concepts · Cloudflare Sandbox SDK docs
description: These pages explain how the Sandbox SDK works, why it's designed
  the way it is, and the concepts you need to understand to use it effectively.
lastUpdated: 2025-10-21T14:02:11.000Z
chatbotDeprioritize: false
source_url:
  html: https://developers.cloudflare.com/sandbox/concepts/
  md: https://developers.cloudflare.com/sandbox/concepts/index.md
---

These pages explain how the Sandbox SDK works, why it's designed the way it is, and the concepts you need to understand to use it effectively.

* [Architecture](https://developers.cloudflare.com/sandbox/concepts/architecture/) - How the SDK is structured and why
* [Sandbox lifecycle](https://developers.cloudflare.com/sandbox/concepts/sandboxes/) - Understanding sandbox states and behavior
* [Container runtime](https://developers.cloudflare.com/sandbox/concepts/containers/) - How code executes in isolated containers
* [Session management](https://developers.cloudflare.com/sandbox/concepts/sessions/) - When and how to use sessions
* [Preview URLs](https://developers.cloudflare.com/sandbox/concepts/preview-urls/) - How service exposure works
* [Security model](https://developers.cloudflare.com/sandbox/concepts/security/) - Isolation, validation, and safety mechanisms

## Related resources

* [Tutorials](https://developers.cloudflare.com/sandbox/tutorials/) - Learn by building complete applications
* [How-to guides](https://developers.cloudflare.com/sandbox/guides/) - Solve specific problems
* [API reference](https://developers.cloudflare.com/sandbox/api/) - Technical details and method signatures
