In this chapter, we will discuss how to work with databases in VisIt. A database can be either a set of files on disk or a running simulation. You can manage both types of databases using the same VisIt windows. First we'll learn about the File Selection Window which allows databases to be selected and grouped. Next, we'll learn how to open databases for visualization using the File Panel before learning how to examine information about a database using the File Information Window. Finally, we'll learn how to reopen a file and close a database.