Free-space optical (FSO) communication is a wireless technology that uses light to transmit data through the atmosphere instead of traditional radio frequency signals. It offers high-speed data transfer rates and is immune to electromagnetic interference, making it a promising solution for urban areas or locations where traditional wireless communication may be limited. FSO systems typically use lasers or light-emitting diodes to transmit data between two points over distances of several kilometers. The technology is still in the research and development stage but has the potential to become a key component of future communication networks.