What is Wi$-$Fi infrastructure? The inner workings of a Wi$-$Fi service or utility, including the signal transmitters, towers, or poles and additional equipment required to send out a Wi$-$Fi signal. A communications technology aimed at providing high$-$speed wireless data over metropolitan area networks. A means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves. A metropolitan area network that uses radio signals to transmit and receive data.