Catalogs are similar to having a Favorites folder, and serve as a way to collect and organize frequently used items regardless of where they are stored. A Catalog is analogous to a folder full of aliases or shortcuts. Placing a file in a Catalog does not create a copy of the file, and does not change where the file is stored. Rather, it stores a reference (or alias) to the file so that it can be found and manipulated without having to search for its physical location.