When to use Azure Active Directory (AD) Business to Business (B2B)?

Source: Authentication and Authorization

When to use Azure Active Directory (AD) Business to Business (B2B)?

Azure AD B2B enables you to securely collaborate with external parties.

Azure Active Directory Business to Business.

• Integrate with identity providers.
• use conditional access policies to intelligently grant or deny access.
• Require Multi-Factor Authentication (MFA) for guest users.