A Guide to Common Types of Two-Factor Authentication on the Web

Two-factor authentication (or 2FA) is one of the biggest-bang-for-your-buck ways to improve the security of your online accounts. Luckily, it’s becoming much more common across the web. With often just a few clicks in a given account’s settings, 2FA adds an extra layer of security to your online accounts on top of your password.

Source: A Guide to Common Types of Two-Factor Authentication on the Web | Electronic Frontier Foundation