2、Bar chart

Bar charts can show numbers changing over a period of time.

This bar chart is the same as a line graph.

However bar charts don't always show time ...

they often only compare numbers.

Can't describe the changes over a period of the time, what we can do? is compare A and B, shop A and shop B for one item or compare different things in one shop.

Compare the bars.

First, make a very general comparision. (Summary / overview paragraph.? 2)?

highest or similar numbers.

Second, compare specific numbers. (Details paragraph 3\4)

compare the numbers of laptops sold in both shops.

the highest for each shop.

making lots of comparisions showing numbers.