Plot devices are techniques used by writers to advance the story and engage the audience. They can include elements like foreshadowing, where hints about future events are dropped, or red herrings, which mislead readers to create suspense. These devices help to build tension and keep the audience guessing about what will happen next. Another common plot device is the flashback, which allows characters to reflect on past events that shape their current actions. This technique provides depth to the story and helps readers understand character motivations. Overall, plot devices are essential tools that enhance storytelling and create a more immersive experience.