A theme is a recurring idea or concept in a text. It is not explicit; therefore, the writer must to look for repeated imagery or symbols, examine the relationships between plot, setting, characters, and structure, and think about the feelings evoked throughout the text. Common themes in literature include love, jealousy, and friendship. If assigned to analyze a theme in Adventures of Huckleberry Finn, you could analyze the theme of friendship between Huck and Jim.