What is the difference between prefab(original) and variant prefab?

Question

I have a door I created with some colors shader and more. When I dragged the door some time ago and it asked me what to do I selected variant. But now I decided to select to create original prefab and the door colors or maybe it's the shader become pink.

This is a screenshot of the prefabs the original and the variant in the Assets. The one in pink is the original the one in red and it should be in red is the variant.

What is the difference between prefab(original) and variant prefab and why it's changing the color to pink when making original ?

What should I choose ? Original or variant ?

And a screenshot of the door in the scene view window before dragging it to the Assets :

Answer 1

Just like you have a regular prefab in order to have a predefined object, you have prefab variants which is just another level. It represents the need to have different predefined versions of the prefab itself. Prefab variants are usefull when you don't want to override the base prefab, but you want to use the overrided one multiple times, so you make a prefab variant.

https://www.youtube.com/watch?v=ibmdm_PoyMA

So basically when you have a prefab instance and you make changes to it, you can either override the original prefab (losing its original state), or you make a prefab variant and then you can have both of them as prefabs.