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Database Models

Please someone help me.
Hierarchical, Network, Relational, and Object-Oriented Of the four types of databases listed above which designs are used for the following websites?
The Internet Movie Database (IMDb):
Source: The Internet Movie Database (IMDb). Retrieved from
• The Internet Public Library (IPL):
Source: The Internet Public Library. Retrieved from
• The Yellow Pages:
Source: The Yellow Pages. Retrieved from
• Popular Search Engine:
Source: Google. Retrieved from
• WebMD:
Source: WebMD. Retrieved from
I am completely lost to me they are all relational but that is not correct please help me understand what they are and why

Solution Preview

Dear Student,
Fields/Records structured in nodes
Nodes are points connected as branches
One parent per node
Parent can have several child nodes (One-Many Relationships)
Eg. Airline Reservation System
Departure California
Arriv LA Chicago NY
Flight No 110 130 209
Passanger Peter Paul Linda

Applications were IBM Information Management System (IMS) and the RDM Mobile

Hierarchical Node arrangement
Each child to have a parent node, Will have more than one parent if in a Many to Many relationship
Additional Nodes are called Pointers
A node can be accessed via more than one route
Eg. University Student System
Course ...

Solution Summary

The solution explains the data models and considers several internet based databases touching on hierarchical, network, relational and object-oriented with examples.