The most basic distinction between introverts and extroverts is from where they draw energy. Introverts draw energy from being alone; being with people drains their energy.
Introverts enjoy spending time with people, but it wears them out rather than energizes them.
Until I read Quiet: The Power of Introverts in a World That Can’t Stop Talking this year, my tendency was to go, go, go, pretending I was an extrovert until I burned out.
Now that I’ve come to terms with the fact that I need alone time to recharge, I pay closer attention to my energy levels. Even extroverts might overdo it during this season’s ample social opportunities, so we should all monitor our energy.