The document summarizes Aristotle's definition and analysis of tragedy based on its key elements of plot, character, thought, diction, melody, and spectacle. According to Aristotle, plot is the most important element and the soul of tragedy. He defines plot as the arrangement of the incidents or events that must be causally linked and of an appropriate size to arouse pity and fear in the audience. Aristotle also analyzed the proper structure, subjects, and types of plots that make for the best tragedies according to his principles.