Bar Graph

A bar graph is a graphical representation of a categorical data. It is made of rectangular bars and each bar represents a category and its corresponding value. Bar graphs are commonly used to show frequency distributions, in which case they are often created using the data in a frequency table.

A bar graph can be oriented either horizontally or vertically by swapping which axis shows the categories and which shows the value of each category. For example, consider a group of students who are asked what their favorite color is. The categories and values will be adjusted accordingly.

The graphical representation of a frequency distribution for numerical data is called a histogram.