The internet is a world-wide network of computers linked via phone lines. It is an amorphous amalgamation of information, images, and transmissions. It exists everywhere and re simultaneously. It is basically nothing more than a set of protocol that allows computers using dissimilar operating systems to communicate. This cross-platform mode of operation is almost unheard of in other industries.
Many applications are possible in internet communication.
The World-Wide Web. The idea was to provide a conduit of information that would survive a nuclear war. This would allow military transmissions to continue in light of the worst-possible scenario. If one link in the chain were eliminated, the network was inoperative. Therefore, if one was knocked out, the rest could still communicate.