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**Graphs**

- In data structures and algorithms, a graph is a data structure that consists of a set of nodes (also called vertices) and a set of edges connecting the nodes. Each edge has a direction and a weight, and may represent a relationship or a flow of information between the nodes it connects. Networks, like social networks, transportation networks, and communication networks, are often shown as graphs. They can be used to model many different kinds of problems, such as finding the shortest path between two nodes or determining whether a graph is connected.