The scatterplot below illustrates several features of scatterplots:

1) Two variables are plotted, one on the ordinate, and the other on the abscissa

2) Each point represents a single case (here, one type of motorcycle produced by BMW)

3) There is a fit line (regression line) drawn into the plot that further identifies the relationship between the two variables

Data are taken from http://www.geocities.com/MotorCity/3906/bmw.html, Marco Tozzini's "Motorcycles Data Bank"