Hierarchical database model
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In a Hierarchical database model is a data model where the data is organised like a tree. The structure allows repeating information using parent/child relationships: each parent can have many children but each child only has one parent. All attributes of a specific record are listed under an entity type.
In a database, an entity type is the equivalent of a table; each individual record is represented as a row and an attribute as a column. Entity types are related to each other using 1: N mapping, also known as one-to-many relationships.
The most recognized and used hierarchical databases are IMS developed by IBM and Windows Registry by Microsoft.