If you hover (or click) on the little magnifying glass next to a search result, you get a preview of the page with some appropriate text highlighted.
Click once on the magnifying glass in the search result to instantly see a preview of the web page.
After activating Instant Previews with that one click, you can hover over any other search result to see a preview of the web page. Learn More
Also interesting to see who is paying to get their results above my organic results.