Google responded to the study saying that based on SimilarWeb data "64.82% of searches on Google (desktop and mobile combined) ended in the search results without clicking to another web property".
Users start with a broad search, like “sneakers” and, after reviewing results, realize that they actually wanted to find “black sneakers.” In this case, these searches would be considered a “zero-click” — because the search didn’t result immediately in a click to a website.
Google provides this information directly on the results page, for example weather forecasts, sports scores, currency conversions.
As an example, people might search for business hours, then drive to the store after confirming a location is open.
Some searches take people directly to apps, rather than to websites.