It’s not super obvious, but macOS actually has 3 Library folders: /Library System/Library Users/<YOUR USERNAME>/Library or ~/Library The last Library is know as the user library, and is where your user customizations will be stored. For instance application data and preferences, and also data and preferences unique to your user account. Your Safari browser cookies and cache is a great example of this. Normally you don’t really want to dig around in the user library (or any of the Libraries really), but sometimes there is good reason. »