Network model Vs. Flat file db model

The Difference between Network and Flat file model

  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.

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A flat file database describes any of various means to encode a database model (most commonly a table) as a single file (such as .txt or .ini).