Line Graph

The above map is a good example of a basic line graph. A line graph is "a graph that uses line segments to show changes in data; the data usually represents a quantity changing over time" (google define). The above line graph shows Dow Jones Industrial Averages from 1985 to 2005. I love line graphs because they are so easy and simple to read.

http://images.freshmeat.net/editorials/r_intro/images/line-graph-1.jpg