|  | 5.1 | Most Common LAN Media
| 5.1.5 | Wireless communication
Wireless signals are electromagnetic waves, which can travel through the vacuum of outer space and through media such as air. Therefore, no physical medium is necessary for wireless signals, making them a very versatile way to build a network. The most common application of wireless data communications is for mobile users. That includes: people in cars or airplanes satellites remote space probes space shuttles anyone/anything that requires network data communications, without having to rely on copper or optical fiber tethers