WhatsApp is rolling out Two-Step Verification for users

How to enable WhatsApp Two-Step Verification 

WhatsApp has begun rolling out two-factor authentication (aka two-step verification) feature for users. The new optional feature is currently available to users of the beta app on Android and Windows, and it adds brings security to the account.

The two-step verification feature is available just for beta users, we can expect it to be rolled out to all users in coming weeks. On Android, beta app users running version 2.16.341 or above will be able to enable the two-step verification.Nokia Power User notes that Windows 10 Mobile beta users, running version 2.16.280 of WhatsApp can enable the security feature.

Users on WhatsApp for Android and Windows betas can enable the two-step verification under Settings > Account > Two-step verification. WhatsApp stresses that the two-step verification feature is an optional feature. It however clearly mentions that if two-step verification is enabled, any attempt to verify phone number on WhatsApp must be accompanied by the six-digit passcode that was created using the feature. WhatsApp also requests for an email address which will be used to disable two-step verification if needed.
"Upon enabling this feature, you can also optionally enter your email address. This email address will allow WhatsApp to send you a link via email to disable two-step verification in case you ever forget your six-digit passcode, and also to help safeguard your account," WhatsApp team explains in a Support page.