Histogram

http://www.vertex42.com/ExcelArticles/mc/Histogram.html

Histograms are graphical representations of the distribution of data. Histograms are comparable to bar graphs, in the sense that they represent the data in a very easy format for people to read. Histograms are most useful when plotting the density of data, for example the amount of people in the US. Most commonly used by the census. The histogram above is of the "Monte Carlo Simulation Results" which from the website I got it from, was just the example they used to show density distribution.