Merge pull request #209636 from OwenRichards1/main

[msid][content-health] authentication-vs-authorization.md (ADO-1976187)

Author: v-regandowner

articles/active-directory/develop/authentication-vs-authorization.md

@@ -9,7 +9,7 @@ ms.service: active-directory
 ms.subservice: develop
 ms.topic: conceptual
 ms.workload: identity
-ms.date: 05/22/2020
+ms.date: 08/26/2022
 ms.author: ryanwi
 ms.reviewer: jmprieur, saeeda, sureshja, ludwignick
 ms.custom: aaddev, identityplatformtop40, scenarios:getting-started
@@ -18,24 +18,28 @@ ms.custom: aaddev, identityplatformtop40, scenarios:getting-started
 
 # Authentication vs. authorization
 
-This article defines authentication and authorization. It also briefly covers how you can use the Microsoft identity platform to authenticate and authorize users in your web apps, web APIs, or apps that call protected web APIs. If you see a term you aren't familiar with, try our [glossary](developer-glossary.md) or our [Microsoft identity platform videos](identity-videos.md), which cover basic concepts.
+This article defines authentication and authorization. It also briefly covers Multi-Factor Authentication and how you can use the Microsoft identity platform to authenticate and authorize users in your web apps, web APIs, or apps that call protected web APIs. If you see a term you aren't familiar with, try our [glossary](developer-glossary.md) or our [Microsoft identity platform videos](identity-videos.md), which cover basic concepts.
 
 ## Authentication
 
-*Authentication* is the process of proving that you are who you say you are. It's sometimes shortened to *AuthN*. The Microsoft identity platform uses the [OpenID Connect](https://openid.net/connect/) protocol for handling authentication.
+*Authentication* is the process of proving that you are who you say you are. This is achieved by verification of the identity of a person or device. It's sometimes shortened to *AuthN*. The Microsoft identity platform uses the [OpenID Connect](https://openid.net/connect/) protocol for handling authentication.
 
 ## Authorization
 
 *Authorization* is the act of granting an authenticated party permission to do something. It specifies what data you're allowed to access and what you can do with that data. Authorization is sometimes shortened to *AuthZ*. The Microsoft identity platform uses the [OAuth 2.0](https://oauth.net/2/) protocol for handling authorization.
 
+## Multifactor authentication
+
+*Multifactor authentication* is the act of providing an additional factor of authentication to an account. This is often used to protect against brute force attacks. It is sometimes shortened to *MFA* or *2FA*. The [Microsoft Authenticator](https://support.microsoft.com/account-billing/set-up-the-microsoft-authenticator-app-as-your-verification-method-33452159-6af9-438f-8f82-63ce94cf3d29) can be used as an app for handling two-factor authentication. For more information, see [multifactor authentication](../authentication/concept-mfa-howitworks.md).
+
 ## Authentication and authorization using the Microsoft identity platform
 
 Creating apps that each maintain their own username and password information incurs a high administrative burden when adding or removing users across multiple apps. Instead, your apps can delegate that responsibility to a centralized identity provider.
 
 Azure Active Directory (Azure AD) is a centralized identity provider in the cloud. Delegating authentication and authorization to it enables scenarios such as:
 
 - Conditional Access policies that require a user to be in a specific location.
-- The use of [multi-factor authentication](../authentication/concept-mfa-howitworks.md), which is sometimes called two-factor authentication or 2FA.
+- Multi-Factor Authentication which requires a user to have a specific device.
 - Enabling a user to sign in once and then be automatically signed in to all of the web apps that share the same centralized directory. This capability is called *single sign-on (SSO)*.
 
 The Microsoft identity platform simplifies authorization and authentication for application developers by providing identity as a service. It supports industry-standard protocols and open-source libraries for different platforms to help you start coding quickly. It allows developers to build applications that sign in all Microsoft identities, get tokens to call [Microsoft Graph](https://developer.microsoft.com/graph/), access Microsoft APIs, or access other APIs that developers have built.
@@ -55,4 +59,4 @@ Here's a comparison of the protocols that the Microsoft identity platform uses:
 For other topics that cover authentication and authorization basics:
 
 * To learn how access tokens, refresh tokens, and ID tokens are used in authorization and authentication, see [Security tokens](security-tokens.md).
-* To learn about the process of registering your application so it can integrate with the Microsoft identity platform, see [Application model](application-model.md).
+* To learn about the process of registering your application so it can integrate with the Microsoft identity platform, see [Application model](application-model.md).