
wo
where
An interrogative adverb used to ask about a place or position.
Wo wohnst du?
Where do you live?
where
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where
An interrogative adverb used to ask about a place or position.
Wo wohnst du?
Where do you live?

where
A relative adverb that introduces a subordinate clause referring to a place in the main clause.
Das ist das Haus, wo ich aufgewachsen bin.
That is the house where I grew up.

where
Used colloquially instead of a relative pronoun (such as der, die, das) to introduce a subordinate clause that does not refer to a place.
Ich suche den Film, wo der Hauptdarsteller am Ende stirbt.
I'm looking for the film where the lead actor dies at the end.

whereas / while
Used more rarely as a conjunction to express contrast or simultaneity, similar to 'während' (while) or 'wohingegen' (whereas).
Sie gibt ihr Geld für Kleidung aus, wo sie doch eigentlich sparen sollte.
She spends her money on clothes, while she really ought to be saving.
'Wo' looks like the English 'who', but it always asks about a place (where?). For a person, German uses the question word 'wer' (who).
Wo ist der nächste Supermarkt?
Where is the nearest supermarket?
As a question word, 'wo' introduces a W-question with the verb in position 2. As a relative adverb or conjunction, it introduces a subordinate clause in which the conjugated verb comes at the end.
Wo beginnt der Wanderweg?
Where does the hiking trail begin?
In spoken language, 'wo' is often used as a universal relative pronoun instead of 'der', 'die', or 'das'. This use is considered stylistically poor in written language and formal contexts.
Kennst du den Film, wo ein Hund die Hauptrolle spielt?
Do you know the film where a dog plays the main role?
As a correct relative adverb, 'wo' must refer to a place or a location expression in the main clause. Typical reference words are 'Stadt' (city), 'Haus' (house), 'Platz' (place), 'Land' (country), or adverbs like 'dort' (there).
Wir fahren nach Berlin, wo meine Tante wohnt.
We are going to Berlin, where my aunt lives.
during / while
“Während” and “wo” can express simultaneity in a subordinate clause. “Während” is the neutral standard choice, whereas “wo” is less common in this use and tends to be colloquial. In a normal written or spoken sentence, “während” is therefore usually the better choice.

Wo ich das Abendessen kochte, hörte meine Schwester im Wohnzimmer Musik.
While I was cooking dinner, my sister listened to music in the living room.
Während ich das Abendessen kochte, hörte meine Schwester im Wohnzimmer Musik.
While I was cooking dinner, my sister listened to music in the living room.