Budget : Back Office Activity

While all of us are waiting for 29th feb, the Dday for budget presentation by FM, we must have in our mind at one time or the other,why and how about the whole budget process and its significance .
I got to see a good piece of writing in ET. I am attaching the image of the same. Its very small in the size so better you click it to enlarge or right click, save it and then enlarge the image to have some budget gyan !