What is SAP NetWeaver
SAP NetWeaver is an application for the integration of business processes and databases from different sources. For this, SAP NetWeaver relies on web service technologies. The basis is the SAP NetWeaver Application Server. SAP NetWeaver is the first fully interoperable, web-based platform that can not only be used for the development of SAP applications - at the same time it forms the basis for various SAP programmes. SAP NetWeaver allows developers to integrate information and processes from geographically distributed locations with various technologies in the sense of a service-oriented architecture (SOA). These include .NET from Microsoft, WebSphere from IBM and Java from Sun Microsystems (Oracle since 2010).
More information on the architecture of SAP NetWeaver and an article from Computer Weekly can be found here.