Two-factor authentication—called two-step verification in the Apple ecosystem—is a security system whereby you have to supply two things—instead of just a single password—to log in to an online (or other) service. Typically, those two factors are a password and a code that the service sends to your cell phone. Requiring those two factors, instead of just one, makes it a lot harder for online miscreants to pretend they’re you.
How to set up two-factor authentication for iCloud
If you looking to setup two way two-factor authentication for iCloud is really easy follow these steps.
STEP 1 :- Log in to your iCloud account at icloud.com
STEP2 :- Now You should open Account Settings by clicking on your name in the upper right corner, then on your Apple ID. That’ll open a new tab in your browser and take you to the My Apple ID page.
Step3:- There, you click on Manage Your Apple ID and sign in (once again). That done, open this Password and Security link. When you do so, you’ll be asked to answer a couple of security questions; do that, then click on Continue. You’ll then go through three instructional screens, explaining the risks and rewards of two-step verification. When you’re ready, click on the Get Started button
Step4:- That’ll take you to this screen, where you supply the phone number of a phone where you can receive SMS messages. (Apple is going to send you a code via SMS; that code is the second factor in the process.) Once you do so, you’ll get to this Verify Phone Number screen.
Step 5:- Now switch over to your phone. You should have a new SMS message there, containing a four-digit code. Go back to your Mac browser and enter that code in the Verification Code boxes.
ITS DONE !!