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• television networks
• transport networks,
  • roads,
  • railroads,
  • shipping routes and
  • airlines,
  • pipelines (gas, petroleum, water, sewage),
• electric circuits - a network of electrical components.
• digital network - a coupled network of digital (binary) components, for combinational or sequential logic (state machine) implementation
• electricity networks ( electric power - generation, transmission and distribution ).
• social networkA social network is a map of the relationships between individuals, indicating the ways in which they are connected through various social familiarities ranging from casual acquaintance to close familial bonds. The analysis of social networks (sometimes cs and business networkA business network can be defined as a group of people that have some kind of commercial relationship. It could be a boss-employee, buyer-supplier, colleague-colleague, etc. An interesting approach is the one used by LinkedIn and ReferNet, which using thes, studied in sociologySociology is the study of social rules and processes that bind and separate people not only as individuals, but as members of associations, groups, and institutions. A typical textbook definition of sociology calls it the study of the social lives of huma and economicsEconomics is the social science studying how society uses its limited resources to meet desires and wants. Put otherwise, economics studies what, how and for whom society produces. This involves analyzing the production, distribution and consumption of go
  • when people meet with each other either for socializing or for assistance, the practice is sometimes referred to as networkingThe word networking can refer to: the activity of expanding and maintanining social networks or business networks For other possible meanings, see network.. Informal meetings of people are sometimes referred to as the Old Boy Network.
  • sexual networks
  • criminalSee crime fiction for a survey of the fictional treatment of crimes and their detection and criminals and their motives. Crime Lake is a lake between Ashton-under-Lyne and Failsworth in Greater Manchester in England. A crime is an act which violates a law networks
• computer networks, which transfer information between computers. (Specific configurations include star networks and grid networks.) The Internet is a large-scale computer network. Also, a website and the whole World Wide Web are networks of webpages, a link web. Note: A distinction is made between wide area networks, (WANs) and local area networks (LANs)
• telecommunications networks
  • public switched telephone networks, which route audio signals from one telephone to another
  • radio networks, which create and distribute radio programming
  • television networks, which create and distribute television programming
  • financial network s, for applications such as funds transfer and credit card authorization .
• network externality in economics
• neural network

In mathematics, a network is usually called a graph. To put it another way, network theory is the applied mathematics counterpart of graph theory. General-purpose mathematical models of network structures and associated algorithms have been developed in graph theory. Computer network routing is a direct application of graph theory to the real world.

Networks can be characterized in a number of different ways. For example, many networks are observed to be scale-free networks, in which a few network nodes act as "very connected" hubs.