Walkie talkie or a handheld transceiver, is a two-way communication device which is used to transmit information real-time.
Generally, they are used to broadcast information to a mass number of listeners in real-time with an option of the users speaking into the device one at a time.
It resembles much like a telephone handset or landlines that are found in homes or businesses.
Technically, it's quite different from the modern communication devices that we use today. Multiple walkie-talkies use a single radio channel and only one radio in that channel can speak at a time, although any number of people can listen to it. The smartphones and telephones that we use today are duplex communicators, this means that they allow a two-way exchange of data (voice) at a time.
Whereas, Walkie Talkie is a half-duplex communication device, which means that it only allows one way of exchange of data (voice) at a time.
To understand it more lucidly, visualise two parties talking on a phone, they can speak together, it might confuse but they still can talk together. If these two parties use walkie talkies then they each would have to speak one at a time, one would be speaking and the other would be listening at that time or vice versa, both cannot perform the same activities together.
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