
weswegen
why
Question adverb meaning „aus welchem Grund“ (for what reason) or „warum“ (why); it asks about the occasion or cause of something.
Weswegen hast du den Termin abgesagt?
Why did you cancel the appointment?
why
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why
Question adverb meaning „aus welchem Grund“ (for what reason) or „warum“ (why); it asks about the occasion or cause of something.
Weswegen hast du den Termin abgesagt?
Why did you cancel the appointment?

which is why
Relative adverb meaning „aus welchem Grund“ (for what reason) or „weshalb“ (why). It introduces a subordinate clause and refers to a situation mentioned previously.
Der Zug hatte Verspätung, weswegen wir den Anschluss verpassten.
The train was delayed, which is why we missed our connection.
In a direct question, „weswegen“ (why) usually appears at the beginning of the sentence. It is followed by the conjugated verb and then the subject.
Weswegen braucht ihr ein größeres Auto?
Why do you need a larger car?
„Weswegen“ (why) can also introduce an indirect question, for example after „wissen“ (to know) or „sich fragen“ (to wonder). The conjugated verb then appears at the end of the subordinate clause; a comma comes before „weswegen“ (why).
Ich frage mich, weswegen die Bibliothek heute geschlossen ist.
I wonder why the library is closed today.
After a statement, „weswegen“ (which is why) refers to the situation mentioned previously, not to a single noun. The following subordinate clause states its consequence; it is separated by a comma and has the conjugated verb at the end.
Die Heizung war ausgefallen, weswegen wir die Nacht bei Freunden verbrachten.
The heating had broken down, which is why we spent the night with friends.