This is the second chapter of Dale Carnegie's Book - How To Win Friends And Influence People. In this chapter, he has told that how can you make people do what you want. How can you convince people to do or behave as per your liking. For the same, he has shared that what is it that every person wants and in what way can you fulfill this want so that others may do things according to you. 

In simple words, it is also one way of convincing people into buying your thoughts.