Illustrations can simplify a complex situation, provide a quick overview of a function in the form of an icon, or simply make a design more pleasant to look at. Often times, illustrations are the best mediums for explaining an abstract context, especially when it comes to companies without any physical products. A well-made graphic in a presentation communicates a high-class and professional impression, and keeps viewers interested. In some instances, illustrations derived from photos can provide license-free image material when photos are too expensive or unavailable in the required resolution.