Some are lightweight and performant, while others are behemoths that require top-tier PCs to run on max settings.
Some shaders focus more on lighting, others on sea, other still on weather effects. The issue comes with deciding on just one shader pack to use - because unlike Minecraft texture packs, you can't layer shader packs on top of one another to combine their effects. There are more shader packs to choose from than there has ever been before, and downloading and installing them has also never been more straightforward. Minecraft shaders have been around for many years now, and each one offers something slightly different in their overall quest to turn your Minecraft worlds into drop-dead gorgeous works of art.
Want to try out the very best Minecraft shaders? Minecraft has always had a very charmingly simple look to it, and in a way it's quite impressive that the 8x8 pixel textures look so good when combined with the dynamic real-time lighting, ray-traced shadows, and volumetric fog of a top-tier shader pack.