Graphical representation is the visual display of data using plots and charts. It is used in many academic and professional disciplines but most widely so in the fields of mathematics, medicine and the sciences. Graphical representation helps to quantify, sort and present data in a method that is understandable to a large variety of audiences.
Several types of mediums are used for expressing graphics, including plots, charts and diagrams. In mathematics, line and dot plots are especially valuable for displaying information. Line plots, which are number lines with the letter "x" placed above numbers to show their frequency, are used to represent numerical data. These plots generally appear as straight horizontal lines: they are used to convey various kinds of data but are most useful when representing a single group of data with less than 50 values. Steam and leaf plots are other types of graphs used to present mathematical data: they are similar to line plots but display data in vertical lines rather than along horizontal axes. Stem and leaf plots are ideal for visually displaying means and averages as well as highlighting outliers and anomalies. Histograms are other common methods of graphical representation: these charts represent frequency distribution using horizontal and vertical lines.