A tonneau cover is a protective cover designed for the open bed of a pickup truck. It helps shield cargo from weather elements like rain and snow, while also providing added security against theft. Tonneau covers come in various styles, including hard and soft options, allowing truck owners to choose based on their needs and preferences. These covers can improve a truck's aerodynamics, potentially enhancing fuel efficiency. Additionally, they offer a clean, finished look to the vehicle, making it more visually appealing. Many tonneau covers are easy to install and remove, providing flexibility for different hauling needs.