Extroverts (or those with extroverted tendencies) gain energy by placing themselves in social situations. They don’t mind being under the spotlight, or the center of attention. However, spending too much alone time drains them mentally.

On the other hand, introverts recharge by spending time alone. After a long period of time in crowded social situations, they need a desperate break to regain their energy back.

The third personality, surprisingly constitutes most of the population, is an ambivert. Ambiverts recharge and regain their energy through a mixture of social interaction and alone time.
www.lifehack.org/...introvert-extrovert-ambivert.html