SAP Process Integration application(SAP PI) is middleware infrastructure that enables you to implement cross-system processes. It enables you to connect systems from different sources (non-SAP and SAP) implemented in different technology platforms to each other. SAP Process Integration is based on an open architecture, uses open standards and offers those services that are essential in a heterogeneous and complex system landscape. Some of the key features of SAP PI include

• Being able to model and design cross-system integration processes, messages and transformations
• 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
• SAP PI supports internal company scenarios and cross-company scenarios.