PI in SAP NetWeaver stands for Process Integration. It is formerly known as SAP XI. SAP PI is one of the core functional components of NetWeaver architecture. It enables an organization to exchange information between their internal software and systems. By using PI they can integrate their applications from multiple systems and it enables the SOA capabilities. SAP PI is built up on SAP Web AS (Web Application Server). For online training on SAP PI go here http://tekslate.com/sap-pi-training/