Aerostats are lighter-than-air vehicles that float in the atmosphere, typically filled with gases like helium or hot air. They are often used for surveillance, weather monitoring, and communication purposes. Unlike traditional aircraft, aerostats are tethered to the ground, allowing them to remain stable in one location for extended periods. These devices can vary in size and shape, ranging from small balloons to large blimps. Aerostats are particularly useful in military applications, where they can provide real-time intelligence and reconnaissance. Their ability to hover at specific altitudes makes them valuable tools for various industries, including meteorology and telecommunications.