Categories are our lines of PCs that are designed for either one purpose or a variety of one major idea. A category will have a Base version, a Clock version (which is more powerful), and other versions that have more specialized hardware for specific things.
The Studio category acts as PCs specialized for creators. There is the Base and Clock version as usual along with the Modify and Model versions. The Modify version is a PC for editing, with hardware that is specialized for such. The Model version is used for modeling in programs such as Blender, and is also specialized for such obviously.