Illustration is the action and effect of illustrate (draw, adorn). In the same way, illustration is a term that is also commonly used referring to the periodical publication that is usually composed of both text and pictures and drawings of diverse typology.
The verb illustrate can also be used synonymously “to give light to the understanding”: The Enlightenment was an European cultural and intellectual movement that developed in the mid 17th Century, having the French Revolution as a symbolic historical phenomenon. It was named like this for its declared purpose of dissipating the darkness of humanity through the lights of reason. For this reason, the 18th Century is known as the Century of Enlightenment and the establishment of faith in progress.
Enlightenment intellectuals defend the idea that human knowledge could combat ignorance, superstition and tyranny to build a better world. The Enlightenment had a great influence in scientific, economic, political and social development at that time. Enlightenment expanded in the bourgeoisie and in a part of the aristocracy society through new ways of publication and diffusion. According to the already much discussed Marxist interpretations, the Enlightenment can be defined as "an historical stage of the global evolution of bourgeois thought".