What is Azure Active Directory B2C (Business-to-Customer) collaboration, and how does it provide identity and access management for customer-facing applications? Azure Active Directory B2C (Business-to-Customer) collaboration is a service provided by Microsoft Azure that enables organizations to securely manage and authenticate external users, such as customers, partners, and suppliers, in their applications. It is designed to simplify the identity and access management (IAM) process for customer-facing applications. Azure AD B2C offers a set of features specifically tailored for external user identities and provides a customizable and scalable identity solution.