Have you ever played Civilization, be it the video game or the board game? If you have, then you’d be familiar with the concept of a ”tech tree.” If you haven’t played any sort of game where you’re leveling up your civilization, then imagine a giant tree and at the bottom of said tree are the technologies that start your civilization off…things like “writing” and “the wheel.” As you go up the tree, you advance in technology, unlocking things like “bronze working” and eventually things like “rocketry.” The tree branches out into different areas of tech, covering different aspects of a civilization like the military and economy.