VTOL stands for "Vertical Take-Off and Landing." It refers to aircraft that can take off, hover, and land vertically, similar to a helicopter. This capability allows VTOL vehicles to operate in confined spaces without the need for long runways, making them useful for urban environments and emergency situations. VTOL technology is being developed for various applications, including military operations and urban air mobility. Examples of VTOL aircraft include the Bell Boeing V-22 Osprey and the Joby Aviation eVTOL, which aim to improve transportation efficiency and reduce congestion in cities.