weil
/vˈaɪl/
because
Definitions
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1
Introduces a subordinate clause giving a reason or cause (the verb moves to the end of the clause).
“Ich bleibe heute zu Hause, weil ich krank bin.”
I'm staying home today because I am sick.
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2
Used in casual spoken German to answer a 'why' question with just the reason.
“Warum lachst du? Weil das wirklich lustig war.”
Why are you laughing? Because that was really funny.
"weil" sends the conjugated verb to the end of its clause (subordinate word order), unlike "denn," which uses normal word order and also means "because."