Bar chart

A chart that uses rectangular bars whose lengths are proportional to the values they represent. Bars can be vertical (also called columns) or horizontal. Bar charts are the standard tool for comparing values across a small set of discrete categories. Categories sit on one axis; values on the other. Bars share a common baseline (almost always at zero) so that lengths can be compared accurately. Variants include stacked, grouped, 100% stacked, diverging, lollipop, and bullet charts — each adapts the basic encoding to a slightly different question.