authelia/docs/features/first-factor.md

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---
layout: default
title: First Factor
parent: Features
nav_order: 1
---
# First Factor
2-Factor authentication is a method in which a user is granted access by presenting
two pieces of evidence that she is who she claims to be.
**Authelia** requires usual username and password as a first factor.
<p align="center">
<img src="../images/1FA.png" width="400">
</p>
*IMPORTANT: This is the only method available as first factor.*
Authelia supports several kind of users databases:
* An LDAP server like OpenLDAP or OpenAM.
* An Active Directory.
* A YAML file