Introducing the knowledge graph: things, not strings. 

In case you missed it, Google recently announced the Knowledge Graph, their stab at connecting relevance and relationships between one another.  In their blog post announcing the product, they use a search query of [taj mahal] as an example. But the problem has been that when you search for taj mahal, you could be thinking of a mountain, a Grammy Award-winning musician, a casino or even an Indian restaurant. Now, if Google guesses you meant the mountain when in fact you meant the musician, you’ll be able to see alternate results within the sidebar and once you select the musician, you’ll be able to see results relating only to the musician. Smart, right? There’s even more, so you should head on over and give their announcement post a read…

Source googleblog.blogspot.com