People are highly visual.
In fact, according to one of my favorite books on presentation design, Brain Rules by John Medina, vision actually trumps all of the other human senses. The research within the book points out that if you hear something, three days later you will remember only 10% of it. However, if you add a picture you end up remembering 65% of the information. That’s a big difference in recall.
Therefore, when dealing with presentations, we need to fill them with exciting and relevant IMAGES. (For more info on how to use visuals to enhance your presentation, I highly recommend you check out my eBook Slides Made Simple.)