An adapter is a software component that enables communication between business applications and line-of-business systems like SQL Server, Oracle, and SAP. Adapters provide a consistent design experience, support various programming models, and standardize on the Windows Communication Foundation framework. The BizTalk Adapter Pack includes adapters for SQL Server, Oracle Database, Oracle E-Business Suite, SAP, and Siebel to allow exchange of messages and invocation of operations on these line-of-business systems.