A database management system is a collection of programs that enables users to create and maintain a database. It is a general purpose software system that facilitates the process of defining, constructing and manipulating databases for various applications.
There are three models available to organise the data sets in the form of databases. They are:
(a) Relational Model: In this model data elements are organised in the form of tuples (records) and set of tuples form tables.
(b) Hierarchial Data Base Model: In this model data organised in a hierarchial manner.
(c) Network Database Model: In this model related data items are linked by pointers to form a network. All related items can be accessed by tracking through the pointers (links).
Among the three database models relational database model is the most popular model. Network model has associated record at a time language that must be embedded in a host programming language. There is no standard language for the hierarchial model, although most hierarchial DBMS have record at time languages.
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