Basically, this is Iron Man Tony Stark's "Repulsor Technology" that allows him to fly around in his suit and knock bad guys across the room by facing his palm toward them.  The suit carries no fuel for rocket motors or compressed gasses, it just is powered by a miniature "arc reactor" that produces gigawatts of energy, presumably electromagnetic.

This is all bad sci-fi of course,nothing remotely like it exists...UNTIL NOW!  At least according to Dr. Charles Buhler, a seasoned NASA engineer and co-founder of Exodus Propulsion Technologies.  If it works at all, my guess is it somehow interacts with earth's magnetic field to generate propulsion.  If that is the case, it wouldn't work in interstellar or even interplanetary space, which is the primary thing such a holy grail type of propulsion system would be useful for.

Basically it's the anti-gravity force used as a contrivance in practically every sci-fi movie that has everything from small "land speeders" to massive spaceships that magically float up off the ground without using the action-reaction principle of Newton's 2nd Law.  It's right up there with Time Travel as a sci-fi staple that has zero basis in physics to justify it, yet just recently also some physicist claimed to have shown time travel to be possible also.

Desperation makes even really smart people grab hold of any glimmer they can see of hopium.  Really smart theretical physicists find their glimmers in the wildest sci fi they read as kids, and try to make it true.  So far, no.  But who kknows, maybe this time, right?

https://interestingengineering.com/innovation/nasa-veterans-propellantless-propulsion-drive-defies-laws-of-physics

NASA veteran's propellantless propulsion drive defies laws of physics

RE