What's the difference between Snapshots and Virtual Copies?

I've been using snapshots if I want several versions of a photo. I have the original, then I can turn it b/w and have a snapshot called BW, or I can have a very saturated version and call it Saturated, etc.
But I just watched a tutorial where the guy made virtual copies and made changes to them.
They seemed to do the same thing. I just thought that one benefit to the virtual copy version is that you can have each variation show in a slidshow or web gallery (so for that alone, I may go to virtual copies). Other than that, how do they differ and when would one use one over the other?

I use both...for different reasons.
In the case of VC's, it's useful to create them for use in collections where you might want to crop and fine tune images for things like web galleries or slide shows were the changes are not something you want applied to the originals but snapshots don't make the adaptations easy to accomplish.

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