Different types of graph are used to represent statistical data. The most common types are line graphs, bar graphs and pie charts.
Most graphs have two axes: the X axis is horizontal (across the bottom) while the Y axis is vertical (up the left side). The two axes each represent a different set of data. Line graphs are drawn by plotting points by their X and Y coordinates, then joining them together or drawing a line through the middle.
The line graph below shows how energy consumption is expected to rise, while consumption of fossil fuels falls and the demand for renewable energy increases.