# The Betweenness Centrality

Learn about the betweenness centrality, a measure related to the amount of information that passes by a node.

Let’s study a centrality measure that usually has an interpretation of how much information flows through a node inside the network. In other words, the number of parts of a network are connected by this node.

## The betweenness centrality

One thing that can happen when we’re dealing with shortest paths, and in fact, happens a lot in bigger graphs, is to have several paths that have a minimum distance. In this case, the closeness centrality doesn’t change because it uses only the distance value, not the paths themselves.

The **betweenness centrality**, on the other hand, takes the number of paths into account. Let’s start building it block by block.

Let’s define a function that returns the number of shortest paths there are between two nodes:

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