What is the difference between an external hard drive and an external hard drive enclosure?

Can anyone tell me what is the difference between an external hard drive and an external hard drive enclosure? I had just bought a rocketfish 3.5" USB 2.0 Hard Drive Enclosure Kit because I want to put my movies on something portable, but it seems to be that something is missing...

3.5 External HDD Hard Drive Disk Enclosure USB 2.0 IDE
US $14.49
End Date: Thursday Sep-09-2010 3:29:59 PDT
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