TYPO3 is a Web Content management system (CMS) written in the programming language PHP.

It is used more widely in Europe than in other regions, with a larger market share in German-speaking countries, the Netherlands, and France.

TYPO3 supports publishing content in multiple languages due to its built-in localization system.

[7] TYPO3 is able to run on most HTTP servers such as Apache, Nginx or IIS on top of Linux, Microsoft Windows, FreeBSD, macOS, and OS/2.

It uses PHP 7.2 or newer[8] and any relational database supported by the TYPO3 DBAL including MySQL/MariaDB, PostgreSQL, and SQLite.

There are several added special page types, including: Internally, TYPO3 is managed by various PHP arrays.

This means that a TYPO3 system will appear as a unit while actually being composed of the core application and a set of extensions providing various features.

With introduction of TYPO3 4.3 in 2009, Pibase has been replaced (or extended) by the Extbase library, which is a modern, model–view–controller (MVC) based development framework.

Extbase is a backport of some features of FLOW3, renamed Neos Flow, a general web application framework.

[14] International organizations running one or more TYPO3 sites are: Airbus, Konica-Minolta, Leica Microsystems, Air France, Greenpeace, and Meda (Sweden).

Published as FLOW3, now renamed Neos Flow, it along with various other packages then served as the basis for the start of development of project Phoenix.

[82] In January 2017, Neos 3.0 has been published, along with a new version of Flow framework and a name change of its configuration language from TypoScript2 to Fusion.