The Difference Between Polling and Events

(Modified from a presentation I gave a few years back...)

The scenario is my wife is preparing food for us to eat for dinner. I am waiting wondering when food will be ready. With polling, I continuously bother her, asking, "when will food be ready?" With events, I can ask her to tell (notify) me, when food is ready, and I'll either take a nap (sleep) or play a video game (process something else).