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World-Wide Network, called also Internet, is a data transmission network. The Data Transmission is
the science that studies the possibility of the computers and of other hardware, as for example the
fax and the automatic teller, to receive and to transmit information at distance, using above all the
telephone net. Therefore a data transmission network connects between them, through telephone
cables, fiber-optic cables, satellites, etc, a practically limitless number of computers, allowing a
continuous exchange of data and of information between them. Currently the modems, that is the
hardware that translates the language of the computers, modulating to trasmit it in the telephone
net, are the indispensable instruments in order to connect the computers with the telephone net.
But this is only the first phase of the network connection, as also the telephone net is connected to
some particular nodes, called Firewalls, that are connected all over the world between them, through
the true Internet Network. Historically Internet is born at the beginning of 1970, as an experiment of
USA Ministry of Defence. This experiment had the name of "Arpanet". It was simply a data transmission
network that allowed to connect the scientific and academic researchers of the United States of America.
This network, in the case of a war between USA and USSR, with a consequent atomic conflict, would
have had to guarantee the survival of a national communication line, if the traditional structures that
guaranteed the communication, as for example Radio and Television broadcasts, had been destroyed.
In fact they had been arrived at the conclusion that, at the end of an atomic conflict, the part that had
succeeded to maintain working some connections in order to communicate between the several military
and state structures, would easy have prevailed on the other part. Then, luckely, the war and it's catastrophic
consequences there were not, but Arpanet continued to develop in an independent and pacific way. In 1985
the National Science Foundation created NSFNET, a series of dedicated networks, at national level, for the
search and the instruction in the USA. NSFNET grew quickly and fused with other private networks of great
dimensions, as Sprint and MCI. Other fusions and above all the expansion at rhythms of geometric
progression of the connection of private customers, elevated this network to a world-wide level of importance.
So the National Science Foundation withdrew its name from such enterprise, leaving unchanged the network.
In this way Internet or the World-Wide Network was born. Today Internet connects the highest number of
computers of all the world, being divided into several levels of data transmissions, texts, sounds and images.
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