Libraries in OS X
As its name suggests, a library in OS X is a central location for a number of shared resources that the system and applications use, which can include alert sounds, desktop pictures, fonts, Internet plug-ins, and other similar items. Sometimes, as in the case with fonts, these are accessed by multiple applications, but other times individual applications may set up their own resource folders in the library. In addition to static resources, libraries are also used to store temporary items such as caches, preferences, and cookies.
There are four main libraries in OS X that serve similar but different purposes, … Read more