Azure AD Free:

• Cost: Azure AD Free is offered at no additional cost with an Azure subscription.
• Features: It includes essential identity and access management features, such as user and group management, self-service password reset, and basic security and authentication capabilities.

Azure AD Premium P1:

• Cost: Azure AD Premium P1 is a paid subscription service.
• Features: It includes all the features of Azure AD Free and adds additional capabilities, such as self-service group management, cloud-based self-service password reset, advanced security reports, Conditional Access policies, and application proxy for secure remote access to on-premises applications.

Azure AD Premium P2:

• Cost: Azure AD Premium P2 is a higher-level paid subscription service.
• Features: It includes all the features of Azure AD Premium P1 and adds advanced identity protection, identity governance, privileged identity management, and risk-based Conditional Access policies.

Azure AD B2B and B2C:

• Azure AD B2B Collaboration: Allows organizations to collaborate with external partners by providing secure access to resources without the need for external partners to have their own Azure AD tenant.
• Azure AD B2C (Azure Active Directory Business to Consumer): Designed for customer-facing applications and provides identity and access management for external users, such as customers or clients. Pricing for B2B and B2C services may vary based on usage.

Azure AD Domain Services:

• Cost: Azure AD Domain Services has its own pricing separate from Azure AD Premium.
• Features: Provides domain services (e.g., domain join, LDAP support) without the need for traditional on-premises Active Directory. Pricing is based on the number of objects in the directory.

Azure Multi-Factor Authentication (MFA):

• Cost: Azure MFA has its own pricing and can be used with Azure AD Premium or as a standalone service.
• Features: Adds an extra layer of security by requiring users to verify their identity using a second authentication method (e.g., phone call, text message, mobile app) when accessing resources.