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Examples of Graphs
There are many examples of graphs:
- The road network forms a graph, with cities as vertices and
roads as edges. The distance between cities can be used as the cost
of an edge.
- The airline network is a graph, with airports as vertices and
airline flights as edges.
- Communication networks such as the Internet: computers and
switches are nodes, connections between them are links.
- Social networks such as the graph of people who call
each other on the telephone, or friends on Facebook: people are nodes
and there are links to the people they communicate with.
- Distribution networks that model the flow of goods: an oil terminal
is a node, and an oil tanker or pipeline is a link.
- Biological networks model the interactions of biological
systems that communicate via messenger molecules such as hormones.