How to create a database

Database is created to operate large quantities of information by input, store, retrieve and manage the information. It is a centralised location which provides an easy way to access the data by several users.
It does not keep the separate copies of a particular data file still a number of users can access the same data at the same time.

As the given diagram shows, DBMS works as an interface between the user and the centralized database. First, a request or a query is forwarded to a DBMS which works (i.e. a searching process is started on the centralized database) on the received query with the available data and if the result is obtained, it is forwarded to the user.
If the output does not completely fulfill the requirements of the user then a rollback (again search) is done and again search process is performed until the desired output is obtained.