April 20, 2006
The feature puts search results in an expandable/collapsible format. When you expand a result, you get more information from the site right on the search results page. It is possible that if enough information appears there, users will be prone to clicking out to other sites a lot less since they could find more of what it is they are looking for right within Google. However, it is also possible that seeing more information may indicate more relevance o the user and they would also be more prone to click on the link for a site with good, unique content.