Bar charts, sometimes called column chart or line chart is one of the most used charts. The bar with varying lengths represents the data values. The bars are used to compare data values across various categories. The bar chart can be used to show a single data value over multiple categories or even, multiple data type over multiple data values. The bar chart can be used to show:
•Percentages of change or of totals
Single Data Value Over Multiple Categories
If you see in this example, the data value (Sales) is visualized over multiple categories (Months).
Multiple Data Value Over Multiple Categories
If you see in this example, the Sales of each Brand of shoes is visualized over Months. Here multiple values (Sales and Brand) are visualized over a category (Month).
Bar charts can also be used horizontally to display the same information.