In this video, I go over the difference between Azure Business to Business, or B2B and Azure Business to Customer, or B2C.  This is a high-level comparison between the two services for those getting ready for an Azure Certification or designing Azure solutions.

Helpful Links:
Azure Authentication vs. Authorization
https://docs.microsoft.com/en-us/azure/active-directory/develop/authentication-vs-authorization
What is guest user access in B2B
https://docs.microsoft.com/en-us/azure/active-directory/b2b/what-is-b2b
What is Azure AD B2C
https://docs.microsoft.com/en-us/azure/active-directory-b2c/overview
Compare solutions for external identities
https://docs.microsoft.com/en-us/azure/active-directory/b2b/compare-with-b2c