Virtual Page View
Virtual pageview gives marketers the ability to track a “Page View”, even though the page is not physically loaded in the browser.
This is useful if, for example, in checkout processes where a user completes many Actions without leaving or loading a new page.
For example, adding an item to a shopping cart can be captured with a virtual page view even though this action doesn’t load a new page. This can be used in the Funnel configuration.
More using Virtual Page View on Piwik PRO Blog:
More about Virtual Page View on Piwik PRO Help Center:
https://help.piwik.pro/tag-manager/piwik-pro-virtual-page-view/
https://help.piwik.pro/use-cases/virtual-page-views-with-variable/