---
title: "TYPO3 Explained"
manual: "TYPO3 Explained"
version: "11.5"
permalink: "https://docs.typo3.org/permalink/t3coreapi:api-overview@11.5"
source: "Index.rst"
start: true
rendered: "2026-10-21T15:30:00+00:00"
---

> [!WARNING]
> **Attention**
>
> TYPO3 v11 has reached end-of-life as of October 31th 2024 and
> is no longer being maintained. Use the version switcher on the top
> left of this page to select documentation for a supported version of TYPO3.
>
> Need more time before upgrading?
> You can purchase Extended Long Term Support (ELTS) for TYPO3 v11 here:
> [TYPO3 ELTS](https://typo3.com/services/extended-support-elts).

<a id="start"></a>

# TYPO3 Explained {#api-overview}

-   *Version:* 11.5
-   *Language:* en
-   *Author:* TYPO3 contributors
-   *License:*

    This document is published under the
    [Open Publication License](https://www.opencontent.org/openpub/).

-   *Rendered:* Wed, 21 Oct 2026 15:30:00 +0000

---

This official TYPO3 documentation is *the* main document about the enterprise content
management system TYPO3.

---

**Table of Contents:**

-   [Introduction](https://docs.typo3.org/permalink/t3coreapi:introduction-1@11.5)

-   [API A-Z](https://docs.typo3.org/permalink/t3coreapi:api-a-z@11.5)
-   [Coding guidelines](https://docs.typo3.org/permalink/t3coreapi:coding-guidelines@11.5)
-   [Configuration](https://docs.typo3.org/permalink/t3coreapi:configuration-1@11.5)
-   [Extension development](https://docs.typo3.org/permalink/t3coreapi:extension-development-1@11.5)
-   [Security guidelines](https://docs.typo3.org/permalink/t3coreapi:security-guidelines@11.5)
-   [Testing](https://docs.typo3.org/permalink/t3coreapi:testing-1@11.5)