Bar chart

Bar chart comparing human losses of World War Two by country; for each country, a red bar represents the country's human loss in millions, and a blue bar represents the country's human loss as a percentage of its total population.
Example of a grouped (clustered) bar chart, one with horizontal bars

A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally. A vertical bar chart is sometimes called a column chart and has been identified as the prototype of charts.

A bar graph shows comparisons among discrete categories. One axis of the chart shows the specific categories being compared, and the other axis represents a measured value. Some bar graphs present bars clustered or stacked in groups of more than one, showing the values of more than one measured variable.

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