Airships, also known as dirigibles or zeppelins, are large, buoyant aircraft that are filled with gas, such as helium or hydrogen, to provide lift. They have a long, elongated shape and are typically powered by engines that allow them to move through the air. Airships can carry passengers and cargo, making them useful for various purposes, including tourism and surveillance. Unlike airplanes, airships are slower and can stay aloft for extended periods. They are often used for advertising, as their large surface area can display logos and messages. Despite their historical significance, airships are less common today due to advancements in aviation technology.