William Playfair, the father of data visualisation, changed the way we understand information. His bar graphs, pie charts, ...

A bar chart is a diagram that uses rows of horizontal or vertical bars to show information. The title tells you what the bar chart is about. The vertical and horizontal lines are called axes.

Bar graphs are used to show sets of data in more specific categories. 32 students were asked which season was their favourite. The table shows the results. Construct a bar chart that represents ...