The term "apocalypse" has a number of meanings, but its most common usage refers to a catastrophic event that brings about the end of civilization or the world as we know it. The word comes from the Greek apokalypsis, meaning “revelation” or “unveiling.” In religious contexts, particularly in Christianity, an apocalypse is often associated with a prophecy of doom and destruction, such as described in the biblical book of Revelations. However, the term can also be used more broadly to refer to any major disaster or catastrophe that brings about radical change.