die Rückbank
back seat
The rear row of seats in a vehicle, especially in a passenger car.
Die Kinder sitzen angeschnallt auf der Rückbank.
The children are sitting buckled up on the back seat.

back seat
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back seat
The rear row of seats in a vehicle, especially in a passenger car.
Die Kinder sitzen angeschnallt auf der Rückbank.
The children are sitting buckled up on the back seat.

'Rückbank' (back seat) is a simple compound made up of 'rück-' (back/rear) and 'Bank' (bench/seat). So literally it is the 'rear bench seat' in a vehicle.
Auf der Rückbank ist genug Platz für drei Personen.
There is enough room for three people on the back seat.
Pay attention to the difference between dative and accusative: You sit 'auf der Rückbank' (on the back seat; Where? dative), but you put something 'auf die Rückbank' (onto the back seat; Where to? accusative).
Der Hund schläft während der Fahrt immer auf der Rückbank.
The dog always sleeps on the back seat during the drive.
Common expressions are 'auf der Rückbank sitzen' (to sit on the back seat), 'jemanden auf der Rückbank mitnehmen' (to take someone along on the back seat), or 'etwas auf der Rückbank verstauen' (to stow something on the back seat).
Es ist gefährlich, schwere Gegenstände ungesichert auf der Rückbank zu transportieren.
It is dangerous to transport heavy objects unsecured on the back seat.
rear seat / stock / background
'der Fond' and 'die Rückbank' can both mean the rear seating area in a car. In this context, they are therefore similar. 'Rückbank' is the normal everyday word and means the rear row of seats that people sit on. 'Fond' sounds more formal or refined and is more likely to be used in reports, in the context of cars, or when describing comfort. Learners may confuse the words, but in everyday life people almost always say 'Rückbank'. 'Fond' is more suitable when talking about the rear area of a car in a factual or somewhat elegant way.

Das Kind schläft auf der Rückbank, während die Eltern nach Hause fahren.
The child is sleeping on the back seat while the parents drive home.
Im Fond der Limousine haben die Gäste besonders viel Beinfreiheit.
In the rear seat of the limousine, the guests have especially generous legroom.