Database Management System is classified into four types:

Hierarchical Database

• It is a tree like structure where the data is stored in form of a tree.
• In this type of database the parent may have many children but child should have single parent.

Network Database

• This data base is represented as graph that allows many to many relationships.
• In this data base children can have multiple children.

Relational Database

• This relational database is represented in the form of a table.
• Values in rows and column are associated with each other. This database is widely used as it is very easy to use.

Object-Oriented Database

• In this data base everything is stored as objects.
• All the objects in this database will have multiple relationships among them.