Graph API is a restful API that has been developed by Microsoft and is the new way to communicate with Microsoft 365 services. It works the same way as REST API but adds an additional layer of authentication and authorization. 

What does this mean?

  • This means that everything you can do as an application is based on the user interacting with the application. This gives more control in the hands of the user, Admin, and company. 
  • However, please note Graph API is only for MS365 users, and non-MS365 users cannot use Graph API

From Microsoft Overview of Microsoft Graph