What is Shaderpacks and why?

Section.1 | Shaders

Shadepacks offers shaders like ex:(BSL and Lux) as a set of Shaders you can use.

Section.2 | Is Server supported?

It is largely Optional as it runs on the client. Not recomanded for server use

Section.3 | Is the modpack compatible?

Yes along if it is on Fabric and it has mods that does support shaders
(ex: Create does not support Shaders it is not recomanded to mix in with this modpack)