Icloud (iphone) informations?

What is icloud? What can I do with it?

Float

ICloud is online storage.

So if your iPhone is only 8G and you run out of space, you can buy another 10G on iCloud to store music, photos, etc. Or to backup your device in case something goes wrong.

It's handy but not necessary.

See here: http://www.lmgtfy.com/?q=what+is+icloud%3F