Two-step verification (TSV or 2SV), also known as two-step authentication, two-factor authentication, double authentication, and two-factor authentication (2FA), is a way to verify your identity upon login. The two steps required to login are:
1) something you know (your password)
2) something you have (such your phone)
To draw from a common example, your ATM uses 2-step verification when it requires something you know (your password) and something you have (your ATM card.)
Online services are increasingly jumping on the two-step verification bandwagon, as online security becomes more and more important. Here’s list of online services where you can use two-factor authentication.
To learn more about protecting your WordPress login with two-step verification, watch our tutorial How to Add 2-Step Verification to WordPress.