Illustration

The act of clarifying or explaining.The state of being clarified or explained. Material used to clarify or explain.Visual matter used to clarify or decorate a text.illustration, any type of picture or decoration used in conjunction with a text to embellish its appearance or to clarify its meaning. Illustration is as old as writing, with both originating in the pictograph. With the advent of printing, the art of hand-painted illumination declined as a means of book illustration.