The bar graph that all other bar graphs aspire to. Normal, non-histogram bar graphs often measure the number of responses to different categories (like colors or candy flavors) in a survey.
The histogram, on the other hand, tracks how many numerical results fit between certain ranges of numbers.
More simply, let’s say we had the following age data of people in our cubicle neighborhood: 21, 43, 41, 38, 53, and 35. If we create ranges of 10s from 0 to 9, 10 to 19, and so on, we’d get one number in the 20s (with a corresponding bar that runs from 20 to 29 that is one unit tall), two numbers in the 30s (with a corresponding bar that runs from 30 to 39 that is one unit tall), one number in the 40s (a bar running from 40 to 49 that is one unit tall), and one in the 50s (with its bar from 50 to 59, also one unit tall).