• A database management system is a software designed to assist in maintaining and utilizing large collection of data.

            Example:- Oracle,MySql,SQL.

•  The alternative to use a DBMS is to store the data in files and write application specific to manage it.
• DBMS allows users to create their own databases as per requirement.
•  It provides an interface between the data and the software application.

Advantage of DBMS

• Data independence. 
• Efficient data access
• Data integrity and security
• Data Administration 
• Concurrent access and data recovery
• Reduce application development time

Types of DBMS 

1. Hierarchical DBMS
2. Network DBMS
3. Relational DBMS
4. Object Oriented

1.Hierarchical DBMS

• In Hierarchical database, model data is organized in a tree like structure.
• Data is stored hierarchically (top down or bottom down ) format .
• Data is represented using a parent child relationship.
• In hierarchical DBMS parent may have many children,but children have only one parent.

2.Network DBMS

• The network database model allow each child to have multiple parents.
• It helps you to address the need to model more complex relationship like many to many relationship.
• In this model,entities are organized in a graph which can accessed through several paths.

3.Relational DBMS 

• Relational DBMS is the widely used DBMS model in the industries because it is one of the easiest.
• Relational DBMS based on the normalization data in the row and column of the tables.
• It is stored in a fixed structures and manipulated using SQL.

4.Object Oriented 

• In object oriented model data data stored in a form of objects. 
• The structure we called is class we stored data within the class.
• It define a database as a collection of objects which store both data members values and operations.