Chart
You might say
Use a chart to compare order changes over these six months, but do not make people guess values from color alone.
A chart is a way to compare and understand data through visual encodings such as position, length, size, or color.A line chart can show orders changing by month, while a bar chart compares counts across channels. Charts make trends and differences easier to notice. They are not the data itself and do not replace a precise table people must check item by item or prove causation.
Also calledData Visualization
Further reading