In this chapter, we discussed the importance of data visualization in different contexts. We also introduced the types of dataset that will be visualized over the course of this book. The flexibility and power of Mathematica as a visualization package was discussed, and we will see the demonstration of these properties throughout the book with beautiful visualizations. Finally, we have taken the first step to writing code in Mathematica. Now we are ready to move onto the next chapter, where we will start writing some actual code to visualize data.