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Under the umbrella of social networks are many different types of graphs.
For instance, the link structure of a can be represented by a directed graph, in which the vertices represent web pages and directed edges represent from one page to another.
A graph in this context is made up of , nodes, or points which are connected by edges, arcs, or lines.
A graph may be undirected, meaning that there is no distinction between the two vertices associated with each edge, or its edges may be from one vertex to another; see for more detailed definitions and for other variations in the types of graph that are commonly considered. Refer to the for basic definitions in graph theory.
In , graphs can represent local connections between interacting parts of a system, as well as the dynamics of a physical process on such systems.
Similarly, in graphs can be used to represent functional connections between brain areas that interact to give rise to various cognitive processes, where the vertices represent different areas of the brain and the edges represent the connections between those areas.