Human activity is unlimited by all means. Right from the beginning of civilization when human beings settled down and started living in social groups, work was divided according to the skill and the ability of the person. Today the activities have broadened further and have become so numerous that they are divided into various categories.
Out of the many sectors of economic activity we have identified few sectors that we would be focusing on. The idea is to cover all the sectors which provide employment to maximum population on this planet and are centers of maximum economic activity.