The word illustration takes our mind to draw something but here it means something else, here Illustration means to show or demonstrate something clearly. Well! what can be better than doing so with real-life examples? Yes, an Illustration essay means expressing thoughts in writing with the help of real-life examples. Using examples is the necessity of an illustration essay. The topic of your illustration essay should also be equally approachable to the readers. Your content, as well as the topic, should be evident.