Google search, a most useful search engine present on the web. It receives millions of queries per day. Have you ever think about the functionality of this search engine? What makes it different from other search engines such as Yahoo and Bing. Why it is at the top? Why everyone (students, engineers, researchers, any common man who use internet) uses it for searching small to big things?
You will get your answer by watching this awesome video demonstration by Matt Cutts. Have a look on it. Hope you will enjoy it.