**What is a daemon?** A daemon is *a system-wide service that always runs in the background at `root`.* **What is an agent?** An agent is *a daemon that runs on behalf of the `mobile` user instead of the `root` user.* **What does every agent and daemon have?** Every agent and daemon has *a corresponding `.plist` file.* > **Which program uses `.plist` files to run agents and daemons?** > The program that uses `.plist` files to run agents and daemons is *`launchd`.* **What is the location of administrator-controlled agents for a specific user?** The location of administrator-controlled agents for a specific user is *`/Library/LaunchAgents`.* **What is the location of system-wide daemons provided by the administrator?** The location of system-wide daemons provided by the administrator is *`/Library/LaunchDaemons`.* **What is the location of default daemons provided by iOS?** The location of default daemons provided by iOS is *`/System/Library/LaunchDaemons`.*