Commerce sites often require the ability for a user to compare items in the product catalog. A simple site may offer the user a single product comparison list. A more complex site may offer the user multiple comparison lists to compare different types of items. A multisite configuration may provide the ability to compare items across sites.

The default implementation of the product comparison system enables the user to compare any number of products and to do so using the products’ category, product, SKU, and inventory information. (You can extend the system to include additional information.) Additionally, it enables the page developer to display product comparison information as a sortable table, which the user can manipulate to change the sort criteria for the displayed information.

This section describes the default implementation of the product comparison system and includes the following subsections: