I'm really confused about these keywords used in Ubuntu. I've a little knowledge about suspend and hibernate in Ubuntu and how does it work. But I've no idea about what are the differences between sleep and standby. In result what are the differences between these four often used terms in Ubuntu?
I searched in Google before asking here but didn't get any answer specific to Ubuntu.
I'll be very happy to get a good definition, and appreciate for the time given to answer this question.