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.
holder
A device or stand used to attach, support, or keep an object in place.
Ich brauche einen neuen Halter für das Navigationsgerät im Auto.
I need a new holder for the navigation device in the car.
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.
owner
The Besitzer is the person who owns a vehicle or animal. The Halter is legally responsible for its possession and upkeep; this can be a different person. When ownership is meant, Besitzer is appropriate; for the responsible role, Halter is the right term.
Ihr Vater ist der Halter des Autos und für seinen Unterhalt verantwortlich.
Her father is the car's registered keeper and is responsible for its upkeep.
Lea ist die Besitzerin des Autos, denn es gehört ihr.
Lea is the owner of the car because it belongs to her.
