to (people, buildings)
Richtung zu Personen, Gebäuden, Orten
Direction toward people, buildings, places
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Ich gehe zum Bäcker.— I'm going to the baker's.
The contractions "zu + dem" → "zum" and "zu + der" → "zur" are mandatory in most contexts: "zum Arzt", "zur Schule", "zum Geburtstag". Uncontracted forms sound formal or emphatic.