A common feature of e-commerce websites is their ability to display products arranged by categories. This can be replicated in Drupal Commerce by making use of the inbuilt taxonomy system of Drupal, which can be used to categorize all content on your website (that is, not just your products).
With Drupal Commerce Kickstart 2, categories are built in as a feature, as you would expect in any e-commerce platform, and can allow customers to find the products they are looking for more quickly.
Log in to your Drupal Commerce administration panel. If you installed the Drupal Commerce Kickstart demo store, you'll already be able to see some sample categories in your store!