For some listings such as software, you can select up to three categories for your product. These categories are used to drive our discovery engine. However, you should only choose categories that are relevant to your product, as users will be frustrated if they find your product listed in categories which don’t don’t make sense to them. In addition, listing in multiple categories might signal to our discovery engine that your product is not as relevant in one of the categories as another company’s product that is only listed in that category. In most cases, only one category is needed.