Catalogs and Categories
Catalogs are collections of products. They are independent from one another, and you can have as many catalogs as required. Catalogs are located at the top of the product hierarchy. They define the Stock Keeping Unit (SKU) options and brands that they can contain. A catalog can also include assets, such as images.
Categories are located below products in the product hierarchy. Use categories to organize products within a catalog. You can also create subcategories within a category.