system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5- What does it mean when a video game is powered by a certain "engine"?

ETA- Thanks guys, that was very helpful!
gpt
Developers don’t write most of the code in their games from scratch.  Instead, they either develop or purchase a toolkit that already includes most of the code required to run the underlying systems the game relies on.

Then the developers use the core “engine” and associated frameworks to assemble assets (artwork, music, models, etc.) and their unique game logic.