Despite sounding similar, CSS transforms are entirely different to CSS transitions. Think of it like this: transitions smooth the change from one state to another, while transforms are defining what the element will actually become. My own (admittedly childish) way of remembering the difference is like this: imagine a transformer robot such as Optimus Prime. When he has changed into a truck he has transformed. However, the period between robot and truck is a transition (he's transitioning from one state to another).

Obviously, if you have no idea who or what Optimus Prime even is, feel free to mentally discard the last few sentences. Hopefully all will become clear momentarily.

There are two groups of CSS3 transforms available: 2D and 3D. 2D variants are far more widely implemented, browser wise, and certainly easier to write so let's look at those first. The CSS3 2D Transforms Module allows us to use the following transforms: