Google continues to improve its search powers to maintain its supremacy. Just recently, if you were able to notice it, Google’s search samples have some improvements.
If you’re going to google for a certain topic, it will also display anchor based links on the search engine snippets. This includes the definition of the main topic you’re searching. It can be found directly below the main search entry.
The main reason why these anchor based links are showing on the search engine snippets is that Google recently added Sitelinks, an anchor based service, to their search engine results.