Final answer:
A character foil is a literary device that contrasts with another character to highlight particular qualities and traits. This technique helps in analyzing literature by providing deeper insight into characters and themes.
Step-by-step explanation:
The literary device designed to illustrate or reveal information, traits, values, or motivations of one character through the comparison and contrast of another character is called a character foil. A foil is a character who contrasts with another character, usually the protagonist, to highlight particular qualities of the other character. For example, a decisive and determined character might be used as a foil to a protagonist who lacks resolve, thereby emphasizing the protagonist's need for a stronger will. Understanding the use of a foil character is important in analyzing literature because it can provide deeper insight into the main characters and the thematic elements of the work.