Shawn King's post | Latest updates on Sulia
MacStories shows you how to enable Two-Step Verification for your Apple ID.
Apple has incorporated two-step verification services for iCloud and Apple ID users in order to make it more difficult for someone to compromise your Apple ID.
You’re not required to use two-step verification (not yet, anyway) if you don’t want to but it's a good idea.
MacStories has a quick guide. http://www.macstories.net/news/how-to-enable-two-step-verification-for-your-apple-id/