A: They're like regular fluctuations, but with more probability.
A: As real as our website's CSS is.
A: No, that's like asking if you can predict your aunt's next meme.
A: Ha! Like you can control your cat's internet usage habits.
A: Only if you count on them for your existence.
A: If by "purposes" you mean "causing random events to happen," then yes, you're welcome.
A: We'll need to see your cat, but probably yes.
See also:
Quantum Fluctuations in Coffee
Or don't.