Apple Aperture - What Are Folders?

Chapter 3 Working with Aperture Projects 75
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You can also create albums within projects to help you organize your images into
relevant groups. For example, images in your Antarctica project can be divided into
three albums: Antarctica Selects, On Land, and Underwater.
You can also place versions from other projects into an album that resides within a project.
What Are Folders?
In Aperture, you use folders to organize projects and albums. For example, you can
import images into projects and then place the projects in folders based on the year,
such as 2002, 2003, 2004, and 2005. If you shoot multiple projects for the same client,
you can create a folder that holds the client’s individual projects.
Folders contain only albums, projects, and other folders. They don’t contain master
files or versions.
Three albums created
within one project
These folders organize
images based on what
year they were shot.