Is an approach to authentication which requires the presentation of two or more authentication factors.

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2FA is an additional layer of security to protect user accounts from attackers that have already compromised your password. When you login into a service using your username and password, you will get an additional challenge before access is granted. Usually it is a 6 digit temporary code that changes every 30 seconds. Google authenticator, Authy and Toopher are just a few of the 2FA solutions Lastpass supports that are based on RFC6238 and RFC4226. There are other types of 2FA but these are the most common.

How to use 2 Factor Authentication in ASP.NET Identity 2.o with Google Authenticator. This blog post is going to show you exactly how to do it.