Skyboxes are a wrapper around your entire scene that shows what the world looks like beyond your geometry.
The tint color
Adjusts the brightness of the skybox.
Changes the rotation of the skybox around the positive y axis.
The textures used for each face of the cube used to store the skybox. Note that it is important to get these textures into the correct slot.
Skyboxes are rendered around the whole scene in order to give the impression of complex scenery at the horizon. Internally skyboxes are rendered after all opaque objects; and the mesh used to render them is either a box with six textures, or a tessellated sphere.
To implement a Skybox create a skybox material. Then add it to the scene by using the Window->Lighting menu item and specifying your skybox material as the Skybox on the Scene tab.
Adding the Skybox Component to a Camera is useful if you want to override the default Skybox. E.g. You might have a split screen game using two Cameras, and want the Second camera to use a different Skybox. To add a Skybox Component to a Camera, click to highlight the Camera and go to Component->Rendering->Skybox.