There are four types of database management systems:
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Hierarchical database: Data is kept in a hierarchical fashion in a tree-like structure called a hierarchical database. The parent may have several children in this database, but each kid should have only one parent.
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Network database: The network database is shown as a graph with many-to-many relationships. Children can have numerous children in this database.
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Relational database: A relational database is represented in the form of a table. The values in the columns and rows are interrelated. Because it is simple to use, it is the most frequently used database.
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Object-Oriented Database: This database stores data values and actions as objects. There are many relationships between all of these items.