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Glossary: Extension

Extension

An Extension in TYPO3 is a modular component that extends the functionality of the CMS. TYPO3 is designed to remain lightweight at its core and gain additional features via extensions.

Types of Extensions

Extensions can serve various purposes:

Backend extensions that add administrative tools or configuration modules
Frontend extensions that render visible content (e.g. forms, calendars)
Interface extensions that integrate external systems or data sources

Technical Structure

A typical extension resides in typo3conf/ext/ (or in Packages/ for Composer-based installations) and contains:

PHP classes for business logic
TCA definitions for data structure configuration
Fluid templates for output rendering
Configuration files (e.g. TypoScript, YAML, service definitions)

Advantages

Modular architecture – include only the features you need
Clear separation of concerns
Extensible and update-safe structure

Typical Use Case

Extensions are used whenever you need to expand TYPO3’s capabilities or add new features—whether via the Extension Manager or Composer. Examples include custom data modules, specialized backend tools, or frontend widgets.

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