The “cloud”, a word used so often yet no one really knows what it entails, including myself. I guess you could try and describe it as a bunch of magical servers somewhere (maybe even in the real clouds) but beyond that you can’t use words. People that work with it feel what the word means but simply cannot put it into words, mostly because of it’s such broad advertised use.
I understand that this probably doesn’t make a whole lot of sense, it’s largely due to my not the best handling Tor the English language.