A computer is an information or data processing system. It accepts data ( input ), performs a set of operations on the data ( processing of the data ), and then presents us with the results ( output ).
The propose of a computer
system, when used for data processing, is to provide
us with useful
information to help increase our understanding of things and phenomena. It allows us to
process large volumes of data or complex patterns of information. It also allows us to
look at the data in different ways and make it more meaningful.
Database software allows you to
create a database. It then allows you to retrieve, manipulate and update the data that you
store in it.Computer 
databases
can handle a large volume of data very quickly.
Information can be easily retrieved. The retrieved data can also be presented in an ordered way and in a Varity of different arrangements. Another big advantage is that the database can be easily updated.
Some common database are dBase IV and FoxPro.