What is XI/PI?

SAP XI/PI (Exchange Infrastructure/Process Integration) is an integration platform that facilitates communication and data exchange between different systems and applications, both within an organization (A2A - Application to Application) and with external partners (B2B - Business to Business). It uses message-based communication and supports various integration scenarios like system integration, business process integration, and data integration. XI was the earlier name, later evolved to PI. It's often used to transform data formats, route messages, and manage integration processes.