Opera villains are characters in operas who often embody traits like ambition, jealousy, and revenge. They drive the plot through their nefarious actions, creating conflict and tension. Famous examples include Iago from Verdi's Otello and Scarpia from Puccini's Tosca, both of whom manipulate others to achieve their goals. These villains are typically portrayed with powerful music that highlights their dark intentions. Their arias often express their inner thoughts and motivations, making them complex figures. The dramatic presence of opera villains adds depth to the story, captivating audiences and enhancing the overall emotional experience of the performance.