Adding a Legend to the Plot

What is a legend?

A legend provides a description for an element in the figure. A legend helps the user understand a figure when the figure contains many elements. For example, if there are two curves on a graph, then the legend can help the user distinguish between the curves.

There is more than one way to add a legend to a figure. In this lesson, we will learn two methods. Both use the plot() function. The difference, however, is in how the two methods set their labels.