Final answer:
A foil character is used in literature to contrast and highlight the traits of another character. An example of a foil character is the Nurse in Romeo and Juliet, who provides a sharp contrast to young Juliet.
Step-by-step explanation:
A foil character is used in literature to contrast and highlight the traits of another character. An example of a foil character is the Nurse in Romeo and Juliet, who provides a sharp contrast to young Juliet. While Juliet is young and impulsive, the Nurse is older and more practical. This contrast helps to emphasize Juliet's youth and romanticism.
This use of the foil can be seen in the characterization of the Nurse in Romeo and Juliet, where her earthiness contrasts Juliet's innocence and nobility, thus accentuating Juliet's traits and aiding in the progression of the story. For example, if the protagonist lacks resolve and motivation, a decisive and determined foil might be used to draw attention to these shortcomings.