A method of structuring data or other information so that the units of data storage are connected by a hierarchically defined pathway.
A database that links data using a hierarchical relationship. The data element at the top of the hierarchy is known as the parent element, and there may be several child elements beneath the parent element. The structure that is created resembles a pyramid or an organizational chart.
the first design of databases. Each object (except the root itself) must have a parent and only one parent. IBM used this design before 1970.