The audience shapes your writing because you must alter vocabulary and tone when targeting your work at a particular demographic. For example, children's books have less sophisticated language accompanied by sophomoric humor so that they can understand the vocabulary and remained entertained while academic journals will likely be written in a scientific, sterile way with more educated words as to target the other students, researchers, and professors reading their work. In the same way, if you are writing an essay to be graded or reviewed by an authority figure, you would use more advanced language to sound professional and intelligent.
