How a Wi-Fi Network Works
In order to understand wireless networking at its simplest level, imagine about a pair of $5 walkie-talkies that you might purchase at mall. The walkie-talkies are small radios that can transmit and receive radio signals. When somebody talks into a walkie-talkie, his voice is picked up by a microphone, encoded onto a radio frequency and transmitted with the antenna.
Another walkie-talkie can receive the transmission with its antenna, decode the voice from the radio signal and drive a speaker. Simple walkie-talkies like this transmit at signal strength of about 0.25 watts, and they can transmit about 500 to 1,000 feet. In order to consider how these walkie-talkies can be used to communicate between the two computers, we have to require that each computer is equipped with a walkie-talkie. Then, we would give each computer a way to set whether it wants to transmit or receive. After that, we would give the computer a way to turn its binary 1s and 0s into two different beeps that the walkie-talkie could transmit and receive and convert back and forth between beeps and 1s/0s. This would actually work.