You can even manually start up your Mac into your macOS Internet Recovery by powering on your system, then holding Option + Command + R keys until the Globe icon appears. And, if the internal recovery drive is corrupt, your Mac automatically switches to the Internet Recovery mode to reinstall macOS from the Apple server however, it requires the Internet connectivity through Wi-Fi or wired connection. When your Mac is not performing as it should, you can use macOS Recovery mode to reinstall macOS.