By default, as you'd expect from any good operating system, certain system files are hidden from the view of the user. This is often for security or simply to stop the user breaking their system by moving/editing/deleting files that they don't understand. In some cases, however, you may need to be able to view these files. In Mac OS X, we need to use the Terminal to edit some of the default properties of the Finder application to do this.
This guide will show you the steps to show these hidden files.