What's the difference between Stand By and Hibernate?

Laptop win xp

What's the difference between Stand By and Hibernate?

Standby (ACPI G1 Sleeping S3 state) is when the monitor and PC fan are switched off but the CPU is running within low power mode and the session is loaded to memory (volitile i.e. RAM). Hibernate (ACPI G1 Sleeping S4 state) turns the computer off completely but loads an "image" of the session to your concrete drive.
The off button (on the wall)
Hibernate primarily shuts your computer down and stores everything that's going on in your computer on the strong drive. Stand By stops everything, but doesn't shut down.
well when you walk to stand by the computer is still on but just halt so to say, is close to turning the computer off but when you turn it on again you stir back to where on earth you were. You can disconnect power and everything, contained by stand by you can do that you will loose infomation
i find with my laptop if i dont use it for some time while switched on it go into hibernation and is a pain to start up again and stand by on my laptop is when the laptop is unused while switched on for a few hours and it goes on to standby and i hold to press the on button to get onto what i be on before
Standby manner that it goes to screensaver and Hibernate mechanism it shuts itself down until you switch it back on again!