If you’re looking for a simple way to describe 2FA to your user base, here’s a good place to start:
[…] Once a bad guy has your login to one website or online service, they consider it a good possibility that you may have used that same login information on other sites and services. Hackers can then try to use the login information to gain access to a user’s account on multiple websites, including banking, credit card and shopping sites.
Due to this problem, many websites, social networks, computer and mobile device makers have begun requiring users to use two-factor authentication to log in to their services, networks and devices.
In this article, I’ll explain what two-factor authentication is, how it works, how it increases the level of security for logins, what the drawbacks are and why you should use it if it’s available.