Two-Factor Authentication makes your Apple ID account much more secure and is strongly recommended for everyone.

When enabled you'll get sent a six-digit code (via an alert window or txt message) after entering your password before you can log into your Apple account. This stops anyone who can steal or guess your password from gaining access to your iCloud data, contacts, photos, emails, etc.

TAKE ACTION

To enable Two Factor Authentication for your Apple-ID:

• Open the Settings App
• Click your account name (at the very top)
• Click Password & Security.
• Tap Turn On Two-Factor Authentication.
• Tap Continue.

You can also do this via the AppleID Website:

• Visit https://appleid.apple.com
• Log into your AppleID account
• In the Security Section, click Edit
• Enable Two-Factor Authentication (STEPS)

MORE INFORMATION

Here's what Apple says about Two-Factor Authentication:

"With two-factor authentication, your account can only be accessed on devices you trust, like your iPhone, iPad, or Mac. When you want to sign in to a new device for the first time, you'll need to provide two pieces of information—your password and the six-digit verification code that's automatically displayed on your trusted devices. By entering the code, you're verifying that you trust the new device. For example, if you have an iPhone and are signing into your account for the first time on a newly purchased Mac, you'll be prompted to enter your password and the verification code that's automatically displayed on your iPhone.

Because your password alone is no longer enough to access your account, two-factor authentication dramatically improves the security of your Apple ID and all the personal information you store with Apple.

Once signed in, you won’t be asked for a verification code on that device again unless you sign out completely, erase the device, or need to change your password for security reasons. When you sign in on the web, you can choose to trust your browser, so you won’t be asked for a verification code the next time you sign in from that computer."

• Apple Support Document on Two-Factor Authentication (Apple)