
die Kulisse
set
The painted backgrounds and movable parts of the stage design in theater or film.
Für das Stück wurde eine beeindruckende Kulisse einer alten Burg aufgebaut.
An impressive set of an old castle was built for the play.
set / backdrop
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set
The painted backgrounds and movable parts of the stage design in theater or film.
Für das Stück wurde eine beeindruckende Kulisse einer alten Burg aufgebaut.
An impressive set of an old castle was built for the play.

backdrop
The background or surroundings against which something takes place; the atmosphere.
Die Alpen boten eine atemberaubende Kulisse für unsere Wanderung.
The Alps provided a breathtaking backdrop for our hike.

behind the scenes
In secret, without the public finding out about it.
Hinter den Kulissen wurde bereits über einen Nachfolger für den Chef verhandelt.
Behind the scenes, negotiations were already taking place about a successor for the boss.
'Kulisse' can literally be the stage set in a theater. Figuratively, however, it also describes an impressive setting or background in real life, for example a landscape.
Die Kulisse für den zweiten Akt wurde schnell umgebaut.
The set for the second act was quickly rebuilt.
In the figurative meaning, 'Kulisse' is often combined with strong adjectives that describe a visual impression. Typical phrases are 'atemberaubende Kulisse' (breathtaking backdrop), 'malerische Kulisse' (picturesque backdrop), or 'beeindruckende Kulisse' (impressive backdrop).
Von der Bergspitze hatten wir eine atemberaubende Kulisse.
From the mountaintop, we had a breathtaking backdrop.
The idiom 'hinter den Kulissen' (behind the scenes) is very common. It means that something happens in secret or without the public's knowledge.
Die eigentlichen Entscheidungen werden oft hinter den Kulissen getroffen.
The real decisions are often made behind the scenes.
background
Der Hintergrund (background) is the rear part of a picture or scene. Die Kulisse (backdrop) refers to the visible surroundings that provide the setting or atmosphere for an action. Hintergrund fits a spatial position; when the surroundings are meant as an effective setting, Kulisse fits.

Auf dem Foto bilden schneebedeckte Berge die Kulisse für die Feier.
Snow-covered mountains form the backdrop for the celebration in the photo.
Auf dem Foto sind im Hintergrund schneebedeckte Berge zu sehen.
Snow-covered mountains can be seen in the background of the photo.