外国人 (wàiguórén) is a noun meaning "foreigner" or "foreign national." It literally combines 外国 (wàiguó, "foreign country") with 人 (rén, "person"), and is the standard neutral term used in official and everyday contexts.
这个小区住了不少外国人。
Zhège xiǎoqū zhù le bù shǎo wàiguórén.
Quite a few foreigners live in this residential complex.
外国人来中国旅游越来越方便了。
Wàiguórén lái Zhōngguó lǚyóu yuè lái yuè fāngbiàn le.
It's becoming easier and easier for foreigners to travel to China.
她经常教外国人学中文。
Tā jīngcháng jiāo wàiguórén xué Zhōngwén.
She often teaches foreigners to learn Chinese.