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Target Disk Mode is a feature that allows one Mac to act as an external hard disk for another Mac. When you connect two Macs using a compatible cable and enable Target Disk Mode on one of them, the Mac in Target Disk Mode essentially presents its storage to the other Mac as though it were an external drive. This is particularly useful for transferring files directly between the two machines at high speeds, utilizing the fast data transfer rates provided by Thunderbolt or USB connections.

This functionality is often employed in situations where you need to quickly transfer large amounts of data, perform migrations from an old Mac to a new one, or access files from a Mac that may be experiencing software issues. By allowing direct access to the file system of the Mac in Target Disk Mode, the other Mac can easily drag and drop files, perform backups, or even copy applications and settings, making it a versatile tool for support and recovery purposes.