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Long-range optical wireless communication
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<p>Long-range optical wireless communication or free-space optical communication (FSO) is an <a href="/facts/Optical_communication/gshoNBto">optical communication</a> technology that uses light propagating in free space to <a href="/facts/Wireless/GfDoFwfo">wirelessly</a> transmit data for <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a> or <a href="/facts/Computer_network/3w5RM99p">computer networking</a> over long distances. "Free space" means air, outer space, vacuum, or something similar. This contrasts with using solids such as <a href="/facts/Optical_fiber_cable/1kD3lpot">optical fiber cable</a>. The technology is useful where the physical connections are impractical due to high costs or other considerations. </p>