Graphs are used to graphically display data. Big tables of numbers can be difficult to interpret so a graph is a good way to present your findings. Different types of graphs are better for displaying certain types of information. 

A Bargraph compares a range of values

A Line Graph shows change or trends

A Pie Chart shows values in relation to one another

A Pictogram uses images instead of numbers for ease of reading

In different subjects you might use graphs in slightly different ways, the list below show some examples:

Science/Technologies approach- infer, mid data point etc?

Maths approach- find trend, predict, calculate

Humanities- why? Explain?

Cross curricular- communicate results/findings in a clear way