What is the difference between systemd rescue mode & emergency mode?

[giantpanda]

Rescue mode.
Allows you to repair a system that has issues on boot up.

• It tries to mount all local filesystems.
• Starts important services.
• No network interface are activated.
• No users are allow on.
• Is same as traditional single user mode.
• Requires the root password to login.

Emergency mode.
Allows to you enter this even if rescue mode does not work.

• Only mounts the root filesystem, read-only.
• No network interfaces are activated.
• Some basic service are started.
• Requires root password to enter this mode.