An <u>allusion</u> is a literary device that makes an indirect <u>reference </u>to a particular historical event, person, place or a piece of work from any art.
Depending on his/her knowledge, a reader must find the <u>meaning</u> or multiple meanings of what is being referenced, as well as understanding the author's intention of using allusion.
By emphasizing something it makes it easier with transition words and it clarifies statements when they get started for example in the body of a paragraph.