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In addition, there can be no standard for all occasions – Today the network transmits the text and images, tomorrow they will transmit moving images and sound.
Computers are connected via a cable, so they can send messages to each other. Because the pull cord between each of the two machines would be too expensive, the network is organized so that in order to get a machine A on machine B, the message may pass through several intermediate machines. On each machine running special programs, which receive the message and understand where to send it on. Just as every house in town is the postal address, every computer on the network has a name by which it can be accessed.
Machines that are not connected to other cable, can exchange messages with other over telephone lines via modem. For this machine, which has a message for another, shall, before her call, agree on the transfer of data and send a message.