Apple has been using two step verification on iOS devices for some time, and now the company has added the feature to Apple iCloud on the web.
Previously, the Apple iCloud website just used a single password to log you in, although this new two step verification now requires you to enter a code as well as your password.
Once you login with your password on Apple iCloud, you will then be sent a security code to one of your trusted devices, once the code is entered you can then get access to your mail, calendar, contacts and all of your iCloud documents.
It appears that this has not been rolled out to all iCloud accounts as yet, as some people are reporting that they are seeing the two step verification system, whilst others are not.
I just tested it with one of my iCloud accounts, and was just asked for the normal password, the two step verification system was not available on my account.
We suspect that Apple is rolling out this feature to Apple iCloud accounts in stages, if you use iCloud, let us know if the comments below whether or not you are seeing the two step verification.