1) Hierarchical Database
A hierarchical database is a design that uses a one-to-many relationship for data elements. Hierarchical database models use a tree structure that links a number of disparate elements to one “owner,” or “parent,” primary record
2)Network database
The network database model allows each record to have multiple parent and multiple child records, which, when visualized, form a web-like structure of networked records. In a hierarchical model, data members can only have a single parent record but can have many child records.
