In Norse belief, Ragnarök refers to a series of apocalyptic events marking the end of the world. It involves a great battle among gods, humans, and various mythical creatures, resulting in the death of key deities such as Odin and Thor. This cataclysm will lead to the submersion of the world in water, but it is also followed by a rebirth, where new lands emerge, and surviving gods restore order. Ragnarök embodies themes of fate, renewal, and the cyclical nature of existence in Norse mythology.