A network is an illustration or a model that shows how different places are linked together, for example the London underground.
A node is a point on a network. It is a place that is linked to the rest of the world in lesser amounts than a global hub, typically a small town or village.
A hub is a large city, often a megacity, that is heavily connected to other hubs and nodes via many different flows.
A flow is the movement of a variety of things between hubs and nodes, for example money, raw materials, manufactured goods and services, information and people.
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