Any discussion of graphics might seem to imply that you are running the program interactively and viewing graphics images on your terminal screen. For the most part, this chapter is written for such a scenario. However, you can run the program in either interactively or batch mode and store graphics images on a file for later viewing and processing. This process is called creating external graphics. External Graphics discusses the procedures for external graphics. The following chapters pertain to obtaining graphics displays interactively on your screen.