What is an Empire, Exactly?

Ever notice how some monarchies are called kingdoms and others are called empires? Aside from kingdoms being ruled by kings and empires by emperors, what exactly is the difference between the two, and what exactly makes an empire an empire?

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📖 SOURCES:
https://en.wikipedia.org/wiki/Empire
https://www.khanacademy.org/humanities/whp-origins/era-3-cities-societies-and-empires-6000-bce-to-700-c-e/36-the-growth-of-empires-betaa/a/read-what-is-an-empire-beta
https://en.wikipedia.org/wiki/Crown_colony
*Just because I have sources doesn't mean my research is infallible. Though I aim for as much accuracy as I can manage, there are likely some facts I have gotten wrong.

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Видео What is an Empire, Exactly? канала KhAnubis