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外に出る
To go outside
The area outside of a building or enclosed space
外は寒いです
It's cold outside
Can also refer to foreign countries or external things in general
Foreign or external (in contrast to domestic or internal)
外国の文化
Foreign culture
外 is often used with particles like に (location) or の (possessive)
The most basic meaning is 'outside' as in physical space
From Middle Chinese 外 (MC ngwɛjH), from Old Chinese *ŋʷˤe[t] (outside)
Can be used as a noun or as a prefix to indicate foreign or external things