Info graphics is simply visual representation of something like visual representation of your website with the help of some graphs pie chart, bar diagrams or with some pictures.We use some templates for some special representation.

How effective it?
I have my personal experience with it Inforgraphic is most attractive way to traffic. People more like graphic representation rather then textual.
While Inforgraphic keep both graphic content representation,. IT mean it is the best way to attract users, content promotion and promotion of your business.