で (because of)
because of, due to
Noun + で
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で after a noun can give a cause: 病気で学校を休みました, "I was off school because I was ill". It's short and neutral, and it only works with nouns: 病気, 雨, 事故, 風邪, 仕事.
It's the same で as "by means of", stretched: the illness is what brought about the absence.
For a cause expressed as a whole clause, use から or ので instead: 雨が降ったから. After a noun, から needs だ (雨だから), so で is the natural short choice.
With 仕事, it can mean "on business": 仕事で大阪に行きます, "I'm going to Osaka for work".
Examples
病気で学校を休みました。
I was off school because I was ill.
雨で試合が中止になりました。
The match was called off because of the rain.
事故で電車が遅れています。
The trains are late because of an accident.
風邪で声が出ません。
I've lost my voice because of a cold.
仕事で大阪に行きます。
I'm going to Osaka for work.