What is Microsoft Entra ID and how does it work

Microsoft Entra ID (formerly known as Azure AD / Azure Active Directory) is Microsoft's cloud-based identity and access management service. It acts as a centralized identity provider that allows employees, partners, and customers to sign in and access resources using a single identity. It integrates with thousands of cloud applications and supports modern authentication standards.

Organizations commonly use Microsoft Entra ID to manage access to services such as Microsoft 365, Microsoft Azure, and third-party SaaS platforms.

Why Microsoft Entra ID is important

As many organizations begin to adopt cloud services and support remote work, identity becomes the primary security boundary. If your organization manages user identities, uses SaaS apps, or requires secure remote access to internal resources, identity platforms are a foundational component.

Microsoft Entra ID helps organizations to:

• Secure access to SaaS and enterprise applications
• Manage identities across cloud and hybrid environments
• Enforce MFA and access policies
• Implement Zero Trust security models
• Simplify authentication for users and administrators

Since it centralizes identity management in the cloud, Microsoft Entra ID helps reduce operational complexity while strengthening access security.

How Microsoft Entra ID works

Microsoft Entra ID stores identity objects such as users, groups, and applications in a cloud directory.

When a user attempts to access an application or resource, Microsoft Entra ID verifies the user’s identity and determines whether the user has the required permissions.

The authentication workflow generally includes three steps.

1. User authentication

   The user verifies their identity using credentials such as passwords, certificates, or MFA.

2. Token issuance

   After successful authentication, Microsoft Entra ID generates a security token.

3. Authorization

   The application validates the token and grants access according to configured policies.

Microsoft Entra ID supports modern authentication protocols such as OAuth 2.0, OpenID Connect, and SAML, enabling secure SSO across applications.

Microsoft Entra ID vs on-premises AD

Although Microsoft Entra ID and traditional directory services share some identity management functions, their architecture and primary use cases differ.

Many organizations use both environments together in hybrid identity deployments.

Microsoft Entra ID in hybrid identity environments

In environments that have both on-premises and cloud infrastructure, Microsoft Entra ID supports hybrid identity deployments by integrating with AD using tools such as Microsoft Entra Connect.

Hybrid identity allows organizations to:

• Synchronize users and groups between on-premises AD and Microsoft Entra ID
• Enable SSO across cloud and on-premises applications
• Maintain centralized identity governance
• Gradually migrate workloads to the cloud

Key capabilities of Microsoft Entra ID

Microsoft Entra ID provides several identity and access management features.

Single sign-on (SSO)

Users authenticate once and access multiple applications without repeated logins.

Multi-factor authentication (MFA)

Adds additional verification factors beyond passwords.

Conditional access

Allows administrators to enforce policies based on user identity, device state, location, and risk signals.

Identity protection

Uses ML to detect risky sign-ins and compromised accounts.

Application identity managementManages application registrations, service principals, and API permissions.

Security certifications and compliance in Microsoft Entra ID

Microsoft Entra ID meets several global security and compliance standards to help organizations meet regulatory requirements.

Common certifications in Microsoft Entra ID include:

• ISO 27001
• ISO 27018
• SOC 1 and SOC 2
• GDPR compliance support
• HIPAA support

Microsoft Entra ID is part of Microsoft's cloud ecosystem and inherits the security and compliance framework of Microsoft's cloud infrastructure.

Common attacks targeting Microsoft Entra ID environments

Identity platforms are a frequent target for attackers. Common attack techniques include:

Password spraying

Attackers attempt commonly used passwords across multiple accounts to bypass account lockout protections.

Phishing attacks

Users are tricked into revealing credentials through fraudulent login pages.

Token theft

Attackers steal authentication tokens to access applications without reauthentication.

Privilege escalation

Compromised accounts are used to obtain administrative permissions.

Consent grant attacks

Malicious applications trick users into granting access to organizational data.

To detect suspicious authentication behavior, organizations often deploy identity monitoring and auditing solutions. Tools like ManageEngine ADAudit Plus help security teams audit Microsoft Entra ID sign-ins, monitor privilege changes, and identify abnormal authentication activity across both on-premises Active Directory and Microsoft Entra ID environments.

Frequently asked questions

Azure AD is now Microsoft Entra ID

In July 2023, Azure Active Directory was renamed to Microsoft Entra ID as part of Microsoft’s broader identity platform.

Although the name has changed, the core functionality remains the same. Microsoft Entra ID continues to provide identity management, authentication, and access control for cloud and hybrid environments.

Many administrators and technical resources still refer to the service as Azure AD, particularly in existing deployments and documentation.