A laser beam is a narrow, highly directional stream of coherent light. Because the light waves are aligned, the beam can travel a long distance with little spread, making it useful for precise illumination, alignment, sensing, and data transmission. In simple terms, it is a very controlled carrier for sending energy or information through free space.
In cyber security, laser beams matter anywhere information is moved or measured with light. They can be used in optical links, laboratory demos, and point-to-point communication systems, where the main challenge is to preserve signal quality and avoid interference. The same properties that make lasers useful also create risk: a beam can be intercepted, disrupted, or used for covert signaling if a system is not designed well. Defenders consider beam stability, line-of-sight exposure, and physical access controls when protecting optical equipment.