In this chapter, we will focus on visualizing change over time. We will learn to plot data in a way that clearly shows the rise and fall of values over time.

After completing this chapter, we will know how to create a line chart. We'll also know when to use a bar chart to visualize time series data. As you can see in the image below, sometimes either a line or a bar chart can be used effectively for this problem. Which one you choose will depend on the nature of our data and the story we want to tell with it.