A vertical take-off and landing (VTOL) aircraft can hover, take off, and land vertically. There are different types of VTOL like Tilt wing, Tilt rotor, Vector thrust, Tail sitter, Tilt fuselage, Ducted fan, Separate engine, Tilt jet. Finally, we looked at tiltrotor aircraft which have very good pros and high stability and high maneuverability. And we finally fused the ducted fan aircraft and tiltrotor aircraft so that we get more thrust due to Ducted fans and we can have the stability of the tiltrotor and also its maneuverability. These aircraft can change the direction of thrust which is beneficial and it seems a perfect balance of everything.
Refer for more information Vertical take-off and landing documentation