Internet is not a network but a set of them. This set of networks provide connection between computers and equipments at a global level. Nowadays mostly all used networks are connected to internet or use the same technology. Why internet is the biggest and the only public network in the world? The simplest answer is all network technologies were designed to be small. Internet was born big and it was designed to be big. Of course some technology advances have been needed but no other network technology has become as big as internet. Once become a standard no other network technology can compete with Internet.

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