This document provides an overview of Business Connectivity Services (BCS) in Microsoft SharePoint 2010, which allows external data to be integrated into SharePoint. It discusses how BCS defines external content types based on data from databases, web services, and other sources. The document also explains that BCS can be used to build solutions that combine external data systems to support specific business roles and processes, and gives examples of help desk and sales dashboard applications built using BCS. Finally, it outlines the high-level architecture of BCS and indicates there will be a hands-on lab to work with the technology.