Can you please elaborate on icloud ?

I cloud is a new service from Apple that keeps your devices in sync. Instead of manually transferring your iTunes purchases,photos and documents in your iPhone 4S, ipad2, iPod and Mac book Air, I cloud will use your apple I'd to wirelessly sync your files and even your place of devices between your many Apple devices

i cloud is an online Platform and an initiative from apple to store your Documents, Music, Files Online. The files can be accessed from any where online by the user & can be automatically synced on apple devices.

It is just similar to Google Drive, Yahoo DropBox for online file syncing. There is a limited space to store the data, and if you want to increase you have Monthly charges as per your Plan.