Define network model in a database model?

Can some one explain the network model of a database model?

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"In many applications, capabilities or objects are modeled as nodes and links in a network. The network model contains logical information such as connectivity relationships among nodes and links, directions of links, and costs of nodes and links. With logical network information, you can analyze a network and answer questions, many of them related to path computing and tracing. For example, for a biochemical pathway, you can find all possible reaction paths between two chemical compounds; or for a road network "

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"(iii) Any databases constitution process that permits pertaining to facts associations in a very online-including type. A single data factor can easily examine numerous information aspects and will itself be directed to by additional data factors. Form a contrast together with relational databases in addition to hierarchical database. "

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The network model is a database model conceived as a flexible way of representing objects and their relationships. Its distinguishing feature is that the schema, viewed as a graph in which object types are nodes and relationship types are arcs, is not restricted to being a hierarchy or lattice. Source:

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