Azure Active Directory B2B: How it works

B2B is based on invitation model which lets you enable access to your corporate applications from partner-managed identities. You can provide email along with the applications you want to share and send invitation to your partners, customers or anyone else who have account in Azure Active Directory. Azure AD sends them an email invite with a link. The partner user follows the link and is prompted to sign in using their Azure AD account or sign up for a new Azure AD account.