FSO is an optical communication method that employs free-space light propagation to wirelessly transport data for telecommunications or computer networking. "Free space" might refer to air, outer space, a vacuum, or something else. This is in contrast to the use of solids such as optical fibre cable.
Free Space Optics Communication have been utilised in various forms for thousands of years. Cleoxenus, Democleitus, and Polybius invented a coded alphabetic system of signalling with torches for the ancient Greeks. Semaphores and wireless solar telegraphs known as heliographs were invented in the modern age, with coded signals used to communicate with their recipients.
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