This document provides an overview of apocalypticism as a genre of prophetic literature that originated in the early centuries after Jesus. It discusses key definitions and characteristics, including that apocalyptic works reveal a hidden divine plan through supernatural beings, describe coming catastrophes and the end of the world, and present a narrative of future events leading to a perfect eternal world for believers. While initially written during times of persecution, apocalypticism also provides an optimistic framework for understanding times of crisis and a vision of future change and salvation.