Simple Bar Chart
A simple bar chart is used to represent data involving only one variable classified on a spatial, quantitative or temporal basis. In a simple bar chart, we make bars of equal width but variable length, i.e. the magnitude of a quantity is represented by the height or length of the bars. The following steps are used to draw a simple bar diagram:

Draw two perpendicular lines, one horizontally and the other vertically, at an appropriate place on the paper.

Take the basis of classification along the horizontal line ( axis) and the observed variable along the vertical line ( axis), or vice versa.

Mark signs of equal breadth for each class and leave equal or not less than half a breadth between two classes.

Finally mark the values of the given variable to prepare required bars.
Example:
Draw simple bar diagram to represent the profits of a bank for years.
Years

1989

1990

1991

1992

1993

Profits (million $$)

10

12

18

25

42

A simple bar chart showing the profits of a bank for 5 years: