When fixing problems on a Mac, sometimes you need to roll up your sleeves and directly modify system settings files in your Library folder. Apple hides the Library folder by default, so it can be tough to locate.

It's not clear why Apple decided to hide the user's Library folder, but you have multiple ways to get it back: two Apple provides (depending on the version of OS X you are using) and one in the underlying file system.

One example of the need to access the Library Folder on Mac would be to rebuild the Database Files in the Library Folder, in order to fix Launchpad related issues like Apps Missing From Launchpad or deleted Apps showing up in the Launchpad.