Definition - What does Network Theory mean?
Network theory is an field of computer science and network sciences and is also part of graph theory (the study of graphs and mathematical structures).
Network theory is often deployed to examine the method of characterizing and modeling complex networks. Many complex networks share some common features, such as scale-free degree distribution.
Techopedia explains Network Theory
In general, network theory is associated with the study of graphs and represented either in symmetric relation or asymmetric relation among discrete objects. Network theory is also applied to logistic networks, gene regularity networks, metabolic networks, the World Wide Web, ecological networks, epistemological networks and social networks.
Network theory is applied in multiple disciplines, including biology, computer science, business, economics, particle physics, operations research and, most commonly, in sociology.