You will see DVD-R and DVD-RW. DVD-R is DVD-Read, you can only move data to this kind of DVD once, another words if you fill it up you cannot write anything else to it. DVD-RW is DVD-Read/Write, you can move data to any as many times as you want. It will allow you to re-use it when it is full.
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That should be obvious. A DVD drive reads and writes data to a DVD. In otherwords, with a DVD drive, you will be able to watch DVDs on your computer. And with a certain DVD drive even MAKE a DVD.
A DVD rewriter is a device that allows you to record on a DVD and erase it to record something else. It is a DVD player as well as a DVD burner.