To illustrate is to make something more clear or more visible. Children's books are illustrated with pictures. An example can illustrate an abstract idea. The word illustrate comes from the Latin illustrate 'to light up or enlighten.
The illustration is a rhetorical style that uses examples to support the thesis or main idea of a paragraph or essay. The illustration is most often used at the paragraph level to help illustrate or support a point, but you may also encounter illustration essays of various types in your college courses.
The topic sentence is the main supportive argument of this particular paragraph. The background sentence starts the illustrative part there can be up to three of them. The Research sentence explains the idea in detail by quoting or paraphrasing pieces of evidence. The analysis explains how it is related to your topic and thesis.
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