Google has changed the guarded formula running its internet search engine to give better answers to the increasingly complex questions posed by web surfers.

The overhaul came as part of an update called “Hummingbird” that Google has gradually rolled out in the past month without disclosing the modifications.

The changes could have a major impact on hit to websites. Hummingbird represents the most dramatic alteration to Google’s search engine since it revised the way it indexes websites three years ago as part of a redesign called “Caffeine,” according to the senior vice president for the company.

Google expects to approach $60 billion this year by the search ads and other commercial pitches related to web content account for most of Google’s revenue, which is .

On September 27 every year Google celebrates its birthday , even though the company was incorporated a few weeks earlier.

Singhal said, the change needed to be done because people have become so reliant on Google that they now routinely enter lengthy questions into the search box instead of just a few words related to specific topics.

Besides Hummingbird, Google also announced a few other updates to existing search features aimed at providing more information. These changes are part of Google’s effort to adapt to the smaller screens of smartphones that aren’t well suited for hopscotching across the Internet.