An application system normally consists of a user
interface, business logic and a database of some sort.
The user interface is something that you can see and
something that is used to
interact with the computer. It could consist of set of screens, web pages
or
reports. Sometimes the user interface is an input device such as a bar
code reader or a voice recognition device. Some application systems
don't have non-visual interfaces. These application systems exchange
data electronically with other applications via a network.
Programming logic consists of one or more computer
programs, scripts or other type of computer instructions that are used to
validate data, perform calculations or navigate the user through the
application system. Most large computer systems use multiple computer
languages.
A database is a repository of data that is used to store
information of interest to the organization in a structured format.
The database could be a set of flat files and/or database tables. The
structure of the database is designed to facilitate data
access and/or updates.
A computer system is simply a set of computer
components that are assembled into an integrated package. The components
can be large or small and can be designed for a single purpose or
for multiple purposes.
