A bar chart can be vertical or horizontal, and what is proportional to the value of the data displayed is the height or length of the bars. It is widely used in professional fields to display and quickly understand a trend.
Numbers placed on the ordinate or and abscissa of horizontal bar graphs are called the scale.
Objective : Conventional comparison of volume or flow. The dimension can also be temporal.
Application : Use multiple indicators in the same group to compare your data. Keep it simple, do not compare more than three indicators at a time.
This is an example of a classic bar chart :