How does icloud work for my apple devices?

I notice my iphone has this icloud feature on it. How does it work? Do i need to register or synch anything up manually? I also have a macbook pro if that matters.

You need to turn on iCloud in the iPhone's Settings and the MacBook's Preferences and choose which features you want to use. For example Photo streaming will automatically send any photos taken with your iPhone to the MacBook.

http://www.apple.com/.../features/

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