Command-R is a keyboard shortcut used to access the macOS Recovery system, an essential feature for troubleshooting and repairing your Mac. This mode allows users to reinstall macOS, restore from a Time Machine backup, use Disk Utility to repair or erase a disk, and access other useful utilities. Understanding how to use Command-R is crucial for maintaining the health and performance of your Mac.

Examples:

1. Accessing macOS Recovery Mode: To enter macOS Recovery Mode, follow these steps:

   • Shut down your Mac.
   • Press the power button to turn on your Mac, then immediately press and hold the Command (⌘) and R keys simultaneously.
   • Release the keys when you see the Apple logo or a spinning globe. Your Mac will boot into macOS Recovery Mode.

2. Reinstalling macOS: Once in Recovery Mode, you can reinstall the operating system:

   • Select "Reinstall macOS" from the macOS Utilities window.
   • Click "Continue" and follow the on-screen instructions to complete the reinstallation process.

3. Using Disk Utility: Disk Utility can be used for disk-related tasks:

   • In the macOS Utilities window, select "Disk Utility" and click "Continue."
   • Choose the disk you want to repair or erase from the sidebar.
   • Click "First Aid" to check and repair the disk, or "Erase" to format the disk.

4. Restoring from Time Machine Backup: To restore your Mac from a Time Machine backup:

   • Select "Restore from Time Machine Backup" in the macOS Utilities window.
   • Click "Continue" and follow the prompts to select your backup and restore your system.