Both “hence” and “why” can be used to express the idea of “this is the reason for…” or “because of this reason…”. However, the way they are used in a sentence can be slightly different:“Hence” is often used at the beginning of a sentence to introduce the result or consequence of something that was mentioned before. For example, “It was raining, hence we stayed indoors. ”
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“Why” is used to introduce the reason or explanation for something, often in response to a question or to explain the reasoning behind a statement. For example, “We stayed indoors. This is why we didn’t see the rainbow. ”
When used together as “hence why”, it’s a more informal way of saying “this is the reason why”. For example, “It was raining, hence why we stayed indoors. ” But remember, this usage is considered informal and is not typically used in formal writing.
