Wireless communication uses electromagnetic, acoustic, or optical means of transmitting and receiving signals instead of wires, cables, or fiber optics.
The advantages of eliminating direct wired physical connections are ease of installation, no cables to run, mobility anywhere within the wireless signal range, and often lower cost without the wires. This also helps with the reliability of the communication. The disadvantages are security challenges with the signal transmitted in the open and the potential for interference for the same reason.
Wireless communication is used for television and radio broadcasting, cellular mobile telephones, wi-fi networks, Bluetooth links, radio frequency identification (RFID) systems, satellite communication, including the Global Positioning System (GPS), and even garage door openers.
Infrared wireless communication systems use light waves in the frequency range of 300 GHz to 400 THz. They offer a line-of-sight range and cannot penetrate walls or other obstructions. They are used remote controls and motion detectors. Acoustic wave transmissions include audio speakers and ultrasound used in medical imaging applications.