In nopCommerce, the product attributes are quantifiable or descriptive aspects of a product (such as color). For example, if you were to create an attribute for color, with the values of blue, green, yellow, and so on, you may want to apply this attribute to shirts, which you sell in various colors (you can adjust a price or weight for any of existing attribute values). You can then map these attributes to a product variant later on.

Unlike product attributes, specification attributes are used for information purposes only (visible on product details page) and can be used for filtering products on the category details page. They are mapped to products and not to product variants. (Product attributes are mapped to product variants, as described in the section above.)