Enterprise Application Integration: These are primarily messaging scenarios with flat file or XML-based data that are between two or more applications, atleast one of which is running in the cloud. A good example would be a travel portal connected to the ticketing systems of multiple airlines.

Business-to-Business Integration: These are messaging scenarios with structured flat file/XML between two organizations. An example would be an IT company procuring hardware from vendors such as HP, Dell, or Lenovo.

Connectivity with Hybrid Applications: These are messaging scenarios between Azure and on-premises applications. An example here would be connecting a Salesforce application to a SAP application running in your internal IT environment.