SAP Process Integration (PI) and Process Orchestration Overview 

SAP Process Integration (PI) and Process Orchestration (PO) (SAP PI/PO) is a middle ware integration platform that helps organisations streamline business processes and integrate systems, applications, and processes. It's based on the Service-Oriented Architecture (SOA) paradigm, which allows software applications to be designed as loosely-coupled services that can be combined and reused to create complex business processes.
SAP PI/PO offers a variety of capabilities, including:
Monitoring and error handling: Tools and dashboards to track message flow, performance metrics, error handling, and system status
Process automation: Graphical modeling tools to create executable process models
Advanced mapping and transformation: Mapping using graphical tools, XSLT, Java, and other scripting languages.
SAP PI/PO makes it easy to synchronize data between different systems. For example, you can use PI to integrate the SAP ERP system with the CRM system, or to synchronize data to a warehouse system.
SAP PI/PO is an on-premises integration platform that has been widely used by organizations for years. However, with the growing adoption of cloud-based solutions, SAP has developed SAP Cloud Platform Integration (CPI) as a modern, cloud-native alternative.