Default environment properties for the entire scene (post-processing effects, lighting and background settings).
The [WorldEnvironment] node is used to configure the default [Environment] for the scene.
The parameters defined in the [WorldEnvironment] can be overridden by an [Environment] node set on the current [Camera]. Additionally, only one [WorldEnvironment] may be instanced in a given scene at a time.
The [WorldEnvironment] allows the user to specify default lighting parameters (e.g. ambient lighting), various post-processing effects (e.g. SSAO, DOF, Tonemapping), and how to draw the background (e.g. solid color, skybox). Usually, these are added in order to improve the realism/color balance of the scene.
https://docs.godotengine.org/en/latest/tutorials/3d/environment_and_post_processing.html
https://godotengine.org/asset-library/asset/123
https://godotengine.org/asset-library/asset/110
https://godotengine.org/asset-library/asset/678
The [Environment] resource used by this [WorldEnvironment], defining the default properties.