owner / holder
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owner / keeper
The person who is legally responsible for the ownership and maintenance of something, especially a vehicle or an animal.
Der Halter des Hundes muss für den entstandenen Schaden aufkommen.
The owner of the dog must pay for the damage caused.
The word 'Halter' (owner/holder) is derived directly from the verb 'halten' (to hold). The ending '-er' forms a noun that can describe either a person who does something (here: someone who owns something or is responsible for it) or a device that does something (here: something that holds an object). This derivation explains both main meanings of the word.
Der Halter des Wagens muss die Versicherung bezahlen.
The owner of the car has to pay the insurance.
Whether a person or a device is meant is always clear from context. If you are talking about legal responsibility, animals, or vehicles, a person is meant. If it is about attaching or setting down objects, a device is meant.
Der Halter des Kampfhundes wurde zu einer Geldstrafe verurteilt.
The owner of the fighting dog was sentenced to a fine.
In the meaning of the responsible person, 'Halter' (owner/keeper) is often used in official or legal contexts. Typical compounds are 'Fahrzeughalter' (vehicle owner) or 'Tierhalter' (animal owner/keeper).
Der Fahrzeughalter ist in den Fahrzeugpapieren eingetragen.
The vehicle owner is listed in the vehicle documents.
As a device, 'Halter' (holder) is often combined with the object it is meant to hold. Common examples are 'Handyhalter' (phone holder), 'Flaschenhalter' (bottle holder), 'Bücherhalter' (book holder), or 'Zahnbürstenhalter' (toothbrush holder).
Ein guter Flaschenhalter am Fahrrad ist bei langen Touren wichtig.
A good bottle holder on a bicycle is important on long trips.
driver
'der Fahrer' and 'der Halter' can both be connected with a vehicle, but they describe different things. 'der Fahrer' is the person who is currently operating the vehicle. 'der Halter' is legally responsible for the vehicle, for example because it is registered in his name. This does not have to be the same person. So you can drive a car without being the registered owner. The words are easy to confuse because in everyday life the owner and the driver are often the same person. For legal questions, 'Halter' is more precise; for the actual act of driving, 'Fahrer' is more precise.
Mein Nachbar ist der Halter des Autos, aber seine Tochter fährt es meistens.
My neighbor is the registered owner of the car, but his daughter drives it most of the time.
Am Montag wird sie im Zug nicht Fahrerin sein, sondern nur mitfahren.
On Monday, she will not be the driver on the train, but only a passenger.