This document provides an overview of Business Connectivity Services (BCS) in SharePoint 2010, including: 1. BCS allows external data to be surfaced in SharePoint and Office applications like Outlook and Word in a reusable way. It extends the reach of enterprise data. 2. Key investment areas of BCS include presentation of external data, connectivity to backend systems, and tooling to assemble solutions. 3. BCS solutions can range from simple to intermediate to advanced, using components like external content types, lists, forms, and custom code implemented in Visual Studio.