MFA may refer to either of the following:
1. Short for multi-factor authentication, MFA is a digital security system that uses several security methods to secure your account on a service. For example, one could use a combination of password, biometrics, or cellphone/e-mail verification codes to log in to the service. MFA gives your account an additional layer of protection in case someone were to get your username and password to your account.
The most common form of MFA is 2FA (two-factor authentication), which requires a combination of two security methods.
2. MFA is a proprietary file extension developed by Clickteam for use in the Games Factory and Fusion game engines. Application files are stored as MFA files, so their frames, layers, and programming are preserved for editing in the software. MFA files can be built into EXE files once completed so they can be used universally.