What is Azure Active Directory (B2C)?
Azure Active Directory (B2C) is a single sign-on integration (SSO) that lets you offer SSO to customers who want their teams to log in using corporate credentials. Unlike the standard Azure AD integration, Azure Active Directory (B2C) lets you offer SSO to multiple teams using their respective active directories rather of relying on a single directory your space owns.
For more information, check out Integrating Azure AD B2C.