The rescue mode is also referred to as the single-user mode. As the name suggests, the rescue mode is used when you want to salvage your system from a system failure, for example, boot failure or reset a password. In rescue mode, all the local filesystems are mounted. However, only salient services are started. Normal services such as network services will not be started.
Emergency mode provides a minimal bootable environment and enables you to repair your Linux system even when rescue mode is not available. In emergency mode, only the root file system is mounted, and in read-only mode. Just as with rescue mode, only the essential services are activated in emergency mode.
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