A graph is a pictorial representation of information recorded in a data table where the independent variable with units are located on the X or horizontal axis and the dependent variable with units are located on the Y or vertical axis.  A graph is used to show relationships between two or more different factors. Always use a descriptive title for the graph (how the independent variable affects the dependent variable).  It may be the same as the title of the data table.

A bar graph shows a quantitative comparison between ordered pairs, using a series of columns to display data.  Usually, the independent variable is all text; it is not a measurement and therefore will not have a unit. Look at the following data table and graph.