You can use Fluid in TYPO3 to do one of the following:
Create a template (theme) using a combination of TypoScript FLUIDTEMPLATE and Fluid. Check out the TYPO3 Sitepackage Tutorial which walks you through the creation of a sitepackage extension.
Create a custom content element type in addition to the already existing content elements TYPO3 supplies.
The previous point describes the lightweight components which are created using a combination of TypoScript and Fluid. If you need more functionality or flexibility in your content element, you can create a content plugin using a combination of Extbase and Fluid. This is explained in t3extbasebook:Index
Use Fluid to create emails using the TYPO3 Mail API.
Use Fluid in backend modules.
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