Comparisons most often come in the form of analogy or simile. An analogy demonstrates the similarity or similarities between two things or concepts, while a simile compares two distinctly different things using the word "like" or "as." Comparisons are created by writers in order to help readers create vivid visual images of the subject matter. Comparisons can also help readers connect something they have not experienced with something they are very familiar with. Not many people have jumped out of an airplane but many have ridden on a rollercoaster, so a writer can compare the experience of skydiving with that first drop on a world class rollercoaster.