Error Chart is usually counted as a part of a series of compatible type (Area, Bar, Column, Line, Marker, Spline, etc.). It’s basically used to demonstrate the error or uncertainty in a measurement. Each Error Bar represents one standard deviation of uncertainty, an error or a certain CI (for example, 95% interval). Sometimes we can add several error bars to a data point if necessary.
This Chart describes the average daily sales of the top 10 cosmetic products. Categories are placed along the vertical x-axis (as usual for Bar Charts), and the value axis is horizontal y-axis, which range is from 0 to 270 pieces per day. If we hover a Bar, a tooltip with the information about the point will pop up. To select a point you should click it once, and to select plenty of points hold the Shift or Ctrl (cmd on Mac) key and keep on clicking the necessary points. We can see that the Chart looks like a standard Bar Chart, but there are line segments of different length placed on the tops of the bars. These line segments show the uncertainty in a measurement.