This document provides an overview of external sharing in Power BI using Azure Active Directory Business-to-Business (Azure B2B) collaboration. Azure B2B allows Power BI content to be securely distributed to guest users outside the organization while maintaining control over internal data. There are three main approaches for sharing - assigning Pro licenses manually, using guest's own licenses, or sharing to guests via Power BI Premium capacity. Azure B2B handles invitations, authentication, and governance policies to control external sharing. All guest actions are audited. Conditional access policies can also be enforced for guests.