A bar graph is a chart that uses different bars ( bars may be of different colour or may be of same colour) to show comparisons between categories of data. These bars can be either horizontal or vertical. It is also called bar chart and it is a graphical display of data using bars of different heights.Bar chart makes data analysis and comparison very easy.
Look at the following bar chart, just looking at the chart you can say maximum number of the students have weight 71 kg. and above.