By using a random series of frequencies.
radio waves or radio frequency
radio waves
Wireless.
Electromagnetic waves, kind of like radio waves or microwaves.
Wireless
Broadcast Radio
Broadcast Radio
Physical Media Twisted-Pair Cable Coaxial Cable Fiber-Optic Cable Wireless Media Broadcast Radio Cellular Radio Microwaves Communication Satellite
The technical term 'wireless telegraphy' has two distinct senses:1: Where 'wireless' is an adjective qualifying the word 'telegraphy', meaning the kind of telegraphy that uses transmission by radio signals instead of over wires;2: Where 'wireless telegraphy' is a noun phrase, meaning the use of radio signals to send telegraphic messages, usually by Morse code.
Wireless communication was first demonstrated in 1866, and the first radio transmission was sent in 1895 by Guglielmo Marconi.
broadcast
wifi bluetooth cellular radio