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Wireless is an encompassing term that describes numerous communication technologies that rely on a wireless signal to send data rather than using a physical medium (often a wire). In wireless transmission, the medium used is the air, through electromagnetic, radio and microwave signals. The term communication here not only means communication between people but between devices and other technologies as well.
Wireless could refer to any device that communicates with other devices wirelessly, meaning there is no physical connection between them. Wireless technology started in the early 20th century with radiotelegraphy using Morse code. When the process of modulation was introduced, it became possible to transmit voices, music and other sounds wirelessly. This medium then came to be known as radio. Due to the demand of data communication, the need for a larger portion of the spectrum of wireless signals became a requirement and the term wireless gained widespread use.
When the word wireless is mentioned, people most often mean wireless computer networking as in Wi-Fi or cellular telephony, which is the backbone of personal communications.
Common everyday wireless technologies include: