Fluid is the next generation templating engine, that will be used in TYPO3 Phoenix. It was backported to TYPO3 v4 so everyone can enjoy the advantages of a full templating engine. But what are those advantages?
Susanne Moog has written an article that gives you insight into what Fluid is about and what it is capable of. According to Susanne you get quick results with a minimal amount of fuss. Fluid is for you! The only requirement is that you are willing to learn!