The drop-off rate shows you what percentage of users end their session from the selected page. Unlike bounce rate, this metric isn't affected by user interactions like clicking or scrolling. This is based only on sessions that were captured.
The drop-off rate can help you better understand why users visited your site and if they are completing the journey you expect them to. For example, if users are leaving the site from an “Order Confirmation” page, this is probably preferred. However, if they are leaving from other pages, it may be because they aren’t finding the information they need to take the desired action.