Is there any other way of transmitting electric signal without wires???

Question

Is there any other way of transmitting electric signal without wires???

Answer 1

Yep, there's radio, microwave and fiber optics

Answer 2

Where have you been that you never heard of radio? or TV?

"signal" means information that is to be conveyed, so that rules out power transformers, but signal transformers fit the requirement.

Also fiber optics and microwaves when used to transfer information.

Answer 3

Or just plain electro-magnetic force.  A transformer is the best example.