Here are some key aspects and features of Azure Active Directory:

1. Identity Management: Azure AD provides a centralized identity management system, enabling organizations to create and manage user identities, groups, and devices.

2. Single Sign-On (SSO): Users can sign in once to access multiple applications and services. Azure AD supports SSO for thousands of cloud applications and on-premises applications using Azure AD Application Proxy.

3. Multi-Factor Authentication (MFA): Azure AD offers strong authentication options, including MFA, to enhance security by requiring additional verification beyond just a password.

4. Conditional Access: Organizations can set policies based on conditions such as user location, device state, and application sensitivity to control access and apply security measures dynamically.

5. Identity Protection: Azure AD Identity Protection helps detect and mitigate identity-related risks and threats, such as suspicious sign-ins and compromised credentials.

6. Self-Service Password Reset: Users can reset their passwords or unlock their accounts without the need for IT assistance, reducing support overhead.

7. Azure AD Connect: This tool allows you to synchronize on-premises Active Directory with Azure AD, enabling hybrid identity scenarios where users can access both on-premises and cloud resources seamlessly.

8. Role-Based Access Control (RBAC): Azure AD can be integrated with Azure RBAC, allowing fine-grained access control for Azure resources based on user roles and permissions.

9. Azure AD B2B and B2C: Azure AD supports business-to-business (B2B) and business-to-consumer (B2C) scenarios, allowing organizations to collaborate securely with external partners and provide identity services for customer-facing applications.

10. Azure AD Domain Services: This service provides managed domain services like domain join, LDAP, and Kerberos authentication in Azure, allowing legacy applications to work with Azure AD.

11. Identity Governance: Azure AD offers tools for managing access reviews, privileged identity management, and lifecycle management to ensure that users have the right access at the right time.

12. Integration with Azure Services: Azure AD integrates seamlessly with other Azure services, including Azure Key Vault, Azure Information Protection, and Azure DevOps, for enhanced security and productivity.

13. Developer Tools: Azure AD provides authentication and authorization solutions for developers, including Azure AD Authentication Libraries (ADAL) and Microsoft Authentication Library (MSAL) for building secure applications.