TYPO3 v10 has reached end-of-life as of April 30th 2023 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.

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Extbase is an extension framework to create TYPO3 frontend plugins and TYPO3 backend modules. Extbase can be used to develop extensions but it does not have to be used.

Extbase is included in the TYPO3 Core as system extension extbase.

You can find an extended tutorial in the tutorial Developing TYPO3 Extensions with Extbase and Fluid.