Dear Rajeev,
Others have given you good answers and also suggestions. So, I will ask you a few questions before giving you some tips.
What do you do and in which industry? What is your background? Do you know how to search the web and have you heard of Wikipedia? The way you have responded to Sanjeev's response indicates that the question may have been an interview question.
I take this opportunity to state that we should give the source from where we cut/copy and paste, to avoid PLAGIARISM.
One of the responses is an example of copy and paste from
http://wikipedia.org <link updated to site home> ) that has not given credit to the source. I found that Googling at
http://wikipedia.org <link updated to site home> ) Hence, it pays to search the web first, as Aussiejohn keeps reminding us at CiteHR.