All computers follow the stages of Input-Process-Output-Storage.
a. The INPUT stage involves putting information into the system.
b. The PROCESS stage involves doing something with the information.
c. The OUTPUT stage involves displaying results.
d. The STORAGE stage keeping data when the computer is switched off.
Lots of other things follow the Input-Process-Output stages, like this:
For example, take a toaster.
For a washing machine you have :
A computer works in the same way :
The hardware devices are grouped by what they are
used for in the system.
A computer system has four main components.
Input devices are used to put information in to the
The Processor is used to do all the work such as calculations,
Output devices used to display the results
Storage devices used to keep information when the computer is
The arrows show how the data flows in the computer system.
Some devices are used for input,
so information flows IN to
Some devices are used for output,
so information flows OUT of
Some devices are used for backing
Information flows OUT of
the processor for saving and flows IN to
the processor when loading.