WhatisAsynchronousProgramming?

The core idea is that waiting is not the same as working. When code waits on a network response or a disk read, the thread can either sit idle or go do something else. Async lets it do something else, which is why an async server handles far more concurrent connections than a thread-per-request one on the same hardware.

In Dart and Flutter this is `Future` and `async`/`await`, and getting it wrong is visible immediately — a synchronous call on the UI thread drops frames and the interface stutters. In Python the equivalent long-running work usually moves out of the request entirely into a Celery task, because a Django view that waits 30 seconds holds a worker the whole time.