What are the main categories based on which applications of computer network can be categorized?

The major areas under which the applications for computer network can be divided are as follows:

Scientific and Technical Computing

   -Client Server Model, Distributed Processing

   -Parallel Processing, Communication Media

Commercial

-Advertisement, Telemarketing, Teleconferencing

-Worldwide Financial Services

Network for the People (this is the most broadly used application nowadays)

-Telemedicine, Distance Education, Person-to-Person Communication, Access to Remote Information, Interactive Entertainment