Beef Up Your Security Leaks and hacks we’ve read about in recent years make it clear that passwords alone aren’t enough to protect your online bank account or social media accounts. Two-factor authentication (2FA or MFA, for multifactor authentication) adds another layer of protection, and PCMag writers frequently exhort our audience to use it. Authenticator apps, such as Authy, Google Authenticator, or Microsoft Authenticator, enable one of the more-secure forms of 2FA. What Is Two-Factor Authentication? As the name implies, it's simply using more than just a password to get into your online account or app—adding another