What is diff bet EDI and XI?

Hi Friends
What is diff bet EDI and XI?
Regards
Vinny Novice

"EDI is a technique used to communicate business transactions between computer systems of different companies and organizations. Note that sometimes the EDI mechanism deployed at a company is often used to interface to other systems within the same organization."
The business data is saved in IDoc format in the IDoc Interface and is forwarded as IDocs. If an error occurs, exception handling is triggered using SAP tasks. The agents who are responsible for these tasks and have the relevant authorizations are defined in the IDoc Interface.
Features
The IDoc Interface supports three types of data flow with the external system:
·        Outbound processing
IDocs are transferred to a receiving system from your SAP System.
·        Inbound processing
IDocs are transferred to your SAP System from an upstream system.
·        Status processing
XI
SAP XI is based on general standards so as to enable external systems to be integrated. At the center of the infrastructure is an XML-based communication that uses HTTP (Hyper Text Transfer Protocol). The application-specific contents are transferred in messages in user-defined XML (eXtensible Markup Language) schema from the sender to the receiver using the Integration Server.
●     Modeling and design of messages, transformations, and cross-component integration processes
●     Configuration options for managing collaborative processes and message flow
●     Runtime for message and process management
●     Adapter Engine for integrating heterogeneous system components
●     Central monitoring for monitoring message flow and processes
Thanks

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