
A typical program uses various values that change during its execution.
For example, we create a program that performs some calculations on the values
entered by the user. The values entered by one user will obviously be different
from those entered in by another user. This means that when creating the
program, the programmer does not know what values will be introduced as input,
and that makes it necessary to process all possible values a user may enter.
When a user enters a new value that will be
used in the process of calculation, we can preserve it (temporarily) in the
random access memory of our computer. The values in this part of memory change
(vary) throughout execution and this has led to their name – variables.
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