Filesystem Domains
In our discussion about the filesystem, you’ve no doubt identified a certain amount of redundancy. There’s a Library folder at the root of the filesystem, one in your Home folder, and one in the System folder. And if you create an Applications folder in your Home folder to store applications that aren’t for use by others, you’ll note that it automatically gets the same folder icon as the Applications folder at the root of the filesystem, as shown in Figure 3-5.
This is the result of a concept known as filesystem domains and is structured to allow multiple users to share the same system or to be hosted on a server so they can use multiple systems and yet provide a consistent experience.

Figure 3-5. The User and Local domains in the Finder