Enterprise Application Integration (EAI, Enterprise Application Integration). Enterprise application integration can take place at different levels:
1 "Data Concentration" at the Data Storage Level: Database Consolidation
2 "Universal Data Exchange Platform" at the transport level: webservice, url api
3 "Business Process Integration" at the Application Level: Page Call Relationship Integration
4 "Common Enterprise Portal" on the User Interface: Single Entry
5 That is the integration of "identity authentication", which is " single sign- on": single-point authentication and authorized login