Azure AD vs Active Directory: Key Differences and When to Use Each

Azure Active Directory (Azure AD) is a cloud-based identity service for managing users and access to cloud apps, while Active Directory (AD) is an on-premises directory service for managing Windows domain networks and resources. Azure AD focuses on cloud identity and access management, whereas AD manages traditional network resources.

Quick Comparison

Here is a quick side-by-side comparison of Azure AD and Active Directory based on key factors.

Factor	Azure Active Directory (Azure AD)	Active Directory (AD)
Type	Cloud-based identity and access management service	On-premises directory service for Windows networks
Primary Use	Manage user access to cloud apps and services	Manage users, computers, and resources in a local network
Protocol Support	OAuth, OpenID Connect, SAML	LDAP, Kerberos, NTLM
Environment	Cloud (Microsoft Azure)	On-premises servers
Device Management	Supports modern device registration	Manages domain-joined devices
Integration	Integrates with Microsoft 365 and SaaS apps	Integrates with Windows Server and local infrastructure

Key Differences

Azure AD is designed for cloud-first identity management. It handles user sign-in and access to cloud applications like Microsoft 365, Azure services, and thousands of SaaS apps. It uses modern web protocols such as OAuth and OpenID Connect, which are optimized for internet-based authentication.

In contrast, Active Directory is built for managing traditional Windows domain networks inside a company. It uses protocols like LDAP and Kerberos to authenticate users and computers within a local network. AD controls access to on-premises resources like file shares and printers.

While Azure AD can integrate with on-premises AD through synchronization tools, they serve different environments and purposes. Azure AD focuses on cloud identity and single sign-on, whereas AD focuses on network resource management and device policies.

Active Directory User Creation Example

This example shows how to create a new user in an on-premises Active Directory using PowerShell.

powershell

New-ADUser -Name "John Doe" -GivenName "John" -Surname "Doe" -SamAccountName "jdoe" -UserPrincipalName "[e-mail]" -AccountPassword (ConvertTo-SecureString "P@ssw0rd" -AsPlainText -Force) -Enabled $true

Output

Creates a new enabled user named John Doe in the Active Directory domain.

Azure AD Equivalent User Creation

This example shows how to create a new user in Azure Active Directory using Azure CLI.

bash

az ad user create --display-name "John Doe" --user-principal-name "[e-mail]" --password "P@ssw0rd" --force-change-password-next-login true

Output

Creates a new user named John Doe in Azure AD with a forced password change on next login.

When to Use Which

Choose Active Directory when you need to manage users, computers, and resources within a local Windows network, especially if you rely on traditional domain-joined devices and on-premises infrastructure.

Choose Azure Active Directory when your focus is on cloud applications, remote access, and modern authentication protocols for SaaS and Microsoft cloud services. Azure AD is ideal for organizations embracing cloud-first strategies.

Many organizations use both together, syncing identities from AD to Azure AD for hybrid environments.

Key Takeaways

Azure AD is cloud-based and focuses on managing access to cloud apps using modern protocols.

Active Directory is on-premises and manages Windows network resources with traditional protocols.

Use AD for local network management and Azure AD for cloud identity and access.

Both can integrate for hybrid identity solutions.

Azure AD supports modern device and user scenarios beyond traditional domain boundaries.