The tag is intended for questions about integration between SAP and non-SAP systems though SAP PI/PO middleware and question covering integration flows between third-party solutions and SAP PI.
SAP Process Integration (PI) currently known as SAP Process Orchestration (PO) is an enterprise application integration middleware that allows building synchronization scenarios and asynchronous communication between SAP and non-SAP systems through SOAP and REST protocols, flat files, IDocs and other means. Additionally PI allows A2A and B2B interfacing and have special adapters for Salesforce, Oracle, Peoplesoft, Siebel, Informatica and others.
Current release of SAP PO includes also SAP BPM and SAP BRM.