When you search, you’re not just looking for a webpage. You’re looking to get answers, understand concepts and explore.
The next frontier in search is to understand real-world things and the relationships among them. Google's Knowledge Graph is a huge collection of the people, places and things in the world and how they're connected to one another. For example, it will be able to tell if your search for “mercury” refers to the planet or the chemical element which will jump start your discovery.
Check out the introductory video: