der Innenraum
interior
The inner area of an enclosed object, such as a building, a vehicle, or a container.
Der Innenraum des Autos ist sehr geräumig und bietet viel Platz.
The interior of the car is very spacious and offers a lot of room.

interior
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interior
The inner area of an enclosed object, such as a building, a vehicle, or a container.
Der Innenraum des Autos ist sehr geräumig und bietet viel Platz.
The interior of the car is very spacious and offers a lot of room.

The word is easy to understand if you break it down: 'innen' (inside) and 'der Raum' (room/space). So it literally means 'the space that is inside'.
Bitte warte im Innenraum, es ist zu kalt draußen.
Please wait inside; it's too cold outside.
In its most common meaning, 'Innenraum' (interior) is often combined with vehicles or buildings. Typical phrases are 'der Innenraum des Autos' (the interior of the car), 'der Innenraum der Wohnung' (the interior of the apartment), or 'den Innenraum gestalten' (to design the interior).
Der Architekt hat den Innenraum des Hauses komplett neu gestaltet.
The architect completely redesigned the interior of the house.
When sports, a stadium, or a racetrack are being discussed, 'Innenraum' (infield) means the central grass or open area surrounded by the running tracks.
Die Siegerehrung findet im Innenraum der Arena statt.
The awards ceremony is taking place in the infield of the arena.
room / space
'der Raum' and 'der Innenraum' can both refer to an area inside something enclosed. 'Raum' is more general and often means a room or an area in a building. 'Innenraum' emphasizes the inner part of something, for example a car, a building, or a container. Learners may confuse the words because a room in a building is, of course, inside. Even so, for an individual room you would normally say 'Raum' or 'Zimmer'. 'Innenraum' is especially appropriate when you mean the inner area as opposed to the outside.

Am Wochenende haben wir den Innenraum des Autos gründlich gereinigt.
At the weekend, we thoroughly cleaned the interior of the car.
Nach dem Essen reservieren sie einen ruhigen Raum für die Besprechung.
After the meal, they reserve a quiet room for the meeting.