Room 23 Video

So I finally found out how to work the easter eggs in the season 3 special features and I found the room 23 video, and there was this quote in the video that makes not sense to me: "The extinction of desire is Nirvana." What does that mean? Is Nirvana a Buddhism reference or some other religious reference? Or is Nirvana an unknown person yet to be discovered in season 6???

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