to compare values, show the lowest and highest points in the dataset, or compare increasing or decreasing trends in the data over time. It is one of the most common and easy-to-understand charts.

USEFULNESS
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• To compare two or more values side by side to visually grasp the difference
• To list key values to quickly find and read them (i.e., revenue per month)
• To rank several data categories from best to worst or the other way around
• To show pattern recognition by visually highlighting gaps, spikes, outliers, or trends

REAL LIFE EXAMPLES

• Annual revenues for major product lines from the previous year, to see which products are performing best and which are failing.
• Total number of visitors per month, grouped by the type of acquisition source, to see where most visitors come from and where to put more efforts.
• Quarterly product sales (in units sold or revenue) for a particular product, to spot seasonal trends or performance issues.
• Number of asthma patients by city, highlighting the environmental effects and increased risks of childhood asthma.

COMPARISON AMOUNG ITEMS

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COMPARISON OVER TIME

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VARIABLE
WIDTH CHART

BAR CHART HORIZONTAL

TABLE WITH
EMBEDDED CHARTS

BAR CHART VERTICAL

CIRCULAR AREA CHART
.

BAR CHART VERTICAL

LINE CHART
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LINE CHART