A Message has to be delivered in the most efficient & clear way possible. Presentations of information rich data often use graphic displays to get the message across and as the video below shows graphic illustration has been used as long as we have been able to draw on a cave wall.
Take a look at this presentation by master visual presenter Steve Jobs talking about the iPAD in 2010. You can see that the combination of simple big text on the screen, the iPAD image and what he is saying all contribute to getting the message across to an audience made up of techno journalists. Here its about getting a promotional message across to an audience about a brand new category of devices the iPAD.
Here’s a talk about the developing world in statistics by Hans Rosling. You might think that would be a boring subject but watch the use of visual technology in getting his message across.