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.
"<span>A shortened, paraphrased version of a text that mentions its key points" would be the proper definition of a summary. Without mentioning the key points, it cannot be a god summary. </span>