You know what a transformer is don't you? Well a transformer is essentially a very effective wireless power transfer device. A microwave oven is another example, but you would have to know what you are doing to design that nd still have live people in the Lab.
A radio, a match, even the Sun are examples of wireless power transfer devices. No magic.
The trick is to get efficient directed transfer with little leakage. Leakage can cause issues, such as in the case of a microwave.
This is just a coined phrase of something that has existed since the Universe became to exist. It is a fun and technically challenging area of engineering even though. Tesla dabbled in this extensively. He envisioned no overhead HV wires, just directed energy from point to point, though his approach lacked enough technological breakthroughs.
The department of defense is working on Tesla's concepts and may actually have a feasible delivery system.
