An electric vertical take-off and landing (eVTOL) aircraft is a wonderful machine that can hover, take off, and land vertically.
This classification can include a variety of types of aircraft including fixed-wing aircraft as well as helicopters and other aircraft with powered rotors, such as cyclogyros/cyclocopters and tiltrotors.
Some eVTOL aircraft can operate in other modes as well, such as CTOL (conventional take-off and landing), STOL (short take-off and landing), or STOVL (short take-off and vertical landing).
Others, such as some helicopters, can only operate by VTOL, due to the aircraft lacking landing gear that can handle horizontal motion. VTOL is a subset of V/STOL (vertical or short take-off and landing). Some lighter-than-air aircraft also qualify as VTOL aircraft, as they can hover, takeoff, and land with vertical approach/departure profiles.
What the role of eVTOL Aircrafts in the future is?
Electric and hybrid-electric vertical takeoff and landing aircraft, or eVTOLs, are being developed in the quest for fully autonomous passenger air vehicles (PAV).
Besides the ubiquitous helicopter, there are currently two types of eVTOL aircraft in military service: craft using a tiltrotor, such as the Bell Boeing V-22 Osprey, and another using directed jet thrust, such as the Harrier family and new F-35B Lightning II Joint strike Fighter (JSF).
In the civilian sector currently only helicopters are in general use (some other types of commercial VTOL aircraft have been proposed and are under development as of 2017).
Generally speaking, eVTOL aircraft capable of STOVL use it wherever possible, since it typically significantly increases takeoff weight, range or payload compared to pure eVTOL.