Thrillers originated in the 1920s-1930s with Alfred Hitchcock's silent films focusing on suspense and mystery. Over time, thrillers incorporated more graphic murder scenes and psychological themes. Thrillers target audiences aged 18+ due to violent and disturbing content. Common narrative techniques include restricting information, adding twists, and using "McGuffins" to mislead viewers. Typical thriller characters include the protagonist hero, antagonist villain, victim, and characters who help or hinder the hero. Iconic thriller elements are low lighting, ominous sounds, masks/weapons as props, and isolated settings.