What is Hierarchical database model?

         I.               Hierarchical Model: - A hierarchical model represents the data in a tree-like structure in which there is a single parent for each record. To maintain order there is a sort field which keeps sibling nodes into a recorded manner. These types of models are designed basically for the early mainframe database management systems, like the Information Management System (IMS) by IBM. This database model organizes data into a tree like structure with a single root to which all the other data is linked. The hierarchy starts from root data and expands like tree, adding child nodes to the parent nodes. In this model a child node will only have a single parent node. This model efficiently describes many real world relationship like index of a book, recipes. In hierarchical model, data is organized into tree like structure with one, one to many relationship between two different types of data. Here the example of this model: - 

You can easily understand the hierarchical model .
to know other DATABASE  MODELS visit this site https://myrdbmsnotes.blogspot.com/2020/04/database-models-its-definition-database.html