Recovery is an OS X feature that hides a Recovery HD on Macs to facilitate maintenance, recovery and reinstallation if the OS becomes corrupt. This Recovery HD can be booted from by holding ⌘R at boot.

Newer Macs also have the ability to download the Recovery HD image from the internet, , should the Recovery HD not be available.

If your question involves file recovery or data recovery, please use the tag.
If your question involves iOS recovery mode, please use the tag.

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