Who are called expatriates?

An expatriate is somebody who has left their country of origin in order to reside in another country. Expats may leave home for work reasons and seek more lucrative employment in a different country. Expatriates may live for a while overseas or completely renounce their citizenship of one country in favor of another.

https://www.investopedia.com/terms/e/expatriate.asp#:~:text=An%20expatriate%20is%20somebody%20who,country%20in%20favor%20of%20another.