Skybox can be a little bit more than just a pretty picture to cover the infinite void around our level; its properties can play a huge role in how our level is going to be lit:
Default-Skybox is a special material that exists in every Unity project and assigned as a default skybox. You can't edit, delete, or even find this material anywhere in the editor. However, you can replace it with your own custom skybox material.
To add a custom skybox, simply create a material and change its Shader type to Skybox | Procedural.
Now we have a new customizable ...