In mathematics, graph theory is the study of graphs, which are mathematical structures used to model pairwise relations between objects.
Graph theory studies about how network is encoded. The study of graph theory enables us to know how to construct graphs as we will as how to solve problems utilizing graphs.
Graph theory is applicable not just in mathematics, but in almost every field, such as: physics, chemistry, economics, finance, geography, weather forecast, computer science, sociology, psychology, biology as we will as many more.