Why is a “main” game loop necessary for developing a game?

Question

I find that most game development requires a main game loop, but I don\'t know why it\'s necessary. Couldn\'t we implement an event listener and respond to every user action

Answer 1

A game needs to run in real-time, so it works best if it is running on one CPU/core continuously. An event-driven application will typically yield the CPU to another thread when there is no event in the queue. There may be a considerable wait before the CPU switches back to your process. In a game, this would mean brief stalls and jittery animation.