This widget displays the number of products that are out of stock in both your competitors' stores and your own store. It shows the number of products, not the number of out-of-stock URLs.
By clicking on the label, you can view the list of out-of-stock products.
Please note that, by default, out-of-stock product prices are included in reports & position calculations, as well as SmartPrice calculations.
You can change this setting from the Preferences tab on your Settings page.