Most databases created today do not use the hierarchical or network models;these models are generally used with legacy systems that are still operational and must be maintained.

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Most databases today use the relational model or newer models, such as document-oriented or graph databases. The hierarchical and network models were popular in the 1960s-1980s but are not commonly used in modern database design. However, some legacy systems may still use these models, and they need to be maintained for historical or operational reasons.

Most Databases Created Today Do Not Use the Hierarchical or Network