A scatterplot is a way to visualize bivariate data. A scatterplot is a plot of pairs of measurements on a collection of "individuals" (which need not be people). For example, suppose we record the heights and weights of a group of 100 people. The scatterplot of those data would be 100 points. Each point represents one person's height and weight. In a scatterplot of weight against height, the x-coordinate of each point would be height of one person, the y-coordinate of that point would be the weight of the same person. In a scatterplot of height against weight, the x-coordinates would be the weights and the y-coordinates would be the heights.