# 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:

Table: Favorite Type of Movie |
||||

Comedy | Action | Romance | Drama | SciFi |
---|---|---|---|---|

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: Most Popular Fruit

A survey of 145 people revealed their favorite fruit:

Fruit: | Apple |
Orange |
Banana |
Kiwifruit |
Blueberry |
Grapes |

People: | 35 | 30 | 10 | 25 | 40 | 5 |

And here is the bar graph:

For that group of people Blueberries are most popular and Grapes are the least popular.

### Example: Student Grades

In a recent test, this many students got the following 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 and Pie) 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.