TYPO3 extensions are modular add-ons that enhance or extend the core functionality of the TYPO3 content management system. They allow developers to introduce new features, integrate external systems, or customize the behavior of a website — all without modifying the TYPO3 core itself.

An extension can provide anything from simple content elements to complex business logic, backend modules, or API integrations.

• Modular architecture for easy maintenance and updates
• Seamless integration with TYPO3’s backend and frontend
• Customizable through TypoScript and configuration options
• Thousands of community and commercial extensions available via the TYPO3 Extension Repository (TER)

Extensions make TYPO3 highly flexible and scalable, enabling developers and organizations to tailor their CMS exactly to their needs — from small websites to enterprise-grade platforms.