Laser beams can be used like radio waves to carry signals. But, laser beams are not sent through the air. Laser beams are sent through optical fibers. Optical fibers are long, thin strands of glass or plastic. The fibers can carry light for long
distances without letting the light escape. Optical fibers are used by doctors. They let doctors see inside the body. Optical
fibers are used to carry signals for telephone calls and television programs. Signals travel more quickly through optical
fibers than through wires,