# Bar Graphs

A Bar Graph (also called Bar Chart) is a graphical display of data using bars of different heights.

Imagine you just did a survey of your friends to find which kind of movie they liked best:

Comedy Action Romance Drama SciFi Table: Favorite Type of Movie 4 5 6 1 4

We can show that on a bar graph like this:

It is a really good way to show relative sizes: we can see which types of movie are most liked, and which are least liked, at a glance.

We can use bar graphs to show the relative sizes of many things, such as what type of car people have, how many customers a shop has on different days and so on.

### Example: Nicest Fruit

A survey of 145 people asked them "Which is the nicest fruit?":

 Fruit: Apple Orange Banana Kiwifruit Blueberry Grapes People: 35 30 10 25 40 5

And here is the bar graph:

That group of people think Blueberries are the nicest.

Bar Graphs can also be Horizontal, like this:

In a recent test, this many students got these grades:

 Grade: A B C D Students: 4 12 10 2

And here is the bar graph:

You can create graphs like that using our Data Graphs (Bar, Line, Dot, Pie, Histogram) page.

## Histograms vs Bar Graphs

Bar Graphs are good when your data is in categories (such as "Comedy", "Drama", etc).

But when you have continuous data (such as a person's height) then use a Histogram.

It is best to leave gaps between the bars of a Bar Graph, so it doesn't look like a Histogram.