A picture is worth a thousand words. It's also worth a thousand data points!
A graph can be defined as :
a diagram showing the relation between variable quantities, typically of two variables, each measured along one of a pair of axes at right angles.
The different uses of graphs are :
Line graphs can be used to compare changes over the same period of time for more than one group. Pie charts are best to use when you are trying to compare parts of a whole. They do not show changes over time. Bar graphs are used to compare things between different groups or to track changes over time.
Other uses of graphs are :
It can show patterns. Like a declining sales line.
It can easily show the breakdown of costs as in a Pie Chart.
It can determine profit and loss in a breakeven analysis.
It can show a comparison of two different processes.
