also: なんで
expression, conjunction
Used after nouns and na-adjectives to give a reason or cause. Equivalent to ので, but なので is the form after a noun or na-adjective stem.
See also: ので
今日は日曜日なので、銀行は休みです。
Since today is Sunday, the bank is closed.
この部屋は静かなので、勉強に集中できます。
Because this room is quiet, I can concentrate on studying.
conjunction
because of that; that's why; therefore
Colloquial use at the beginning of a sentence, referring back to a previously stated reason. Common in casual conversation.
昨日は熱があったんだ。なので、学校を休んだ。
I had a fever yesterday. That's why I skipped school.