What is the difference between (these four) sleep states?

What is the difference between (these four) sleep states? Whilst browsing the internet I found an article here about how to run a Power Efficiency Report. As I wasn't doing anything, I decided to try it and see what it did.
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Guest [Entry]

"S0 - On / Working

The computer is powered up. If supported, power conservation is handled
by each device.

S1 - Sleep

CPU is stopped. RAM maintains power. Everything else is off, or in low
power mode.

S2 - Sleep

CPU has no power. RAM maintains power. Everything else is off, or in
low power mode.

S3 - Standby

CPU has no power. RAM maintains power, refreshes slowly. Power supply
reduces power. This level might be referred to as “Save to RAM.” Windows
enters this level when in standby.

S4 - Hibernate

Power to most hardware is shut off. Any files in memory are saved to
the hard disk in a temporary file. If configured, the NIC will remain
on for WOL, or AoL. This level is also known as “Save to disk.”

S5 - Off

Everything is off. No files are saved. If configured, the NIC will maintain
power to listen for WOL (Magic) packets. This is known as a shutdown.

Source"