Question about US/Japan versions of cds

[CHE.R.RY]

Ok, so I hope this doesn't sound too stupid, but cut me some slack here, I've NEVER ordered anything offline. So anyways, I went to YesAsia and I started browsing around and noticed that certain items were tagged as 'Japan' version. Does this mean that they will NOT play on American cd players??? Or does it represent something else? I know this is the way it goes with Dvds, but I don't know about cds.

Once again, I apologize if this sounds dumb ...