Excel Services is a part of Microsoft Office SharePoint Server 2007 and is built on Windows SharePoint Services 3.0 and ASP.NET. Architecturally, it is a composite of Excel Web Access, Excel Web Services, and Excel Calculation Services. While the Excel Web Access is a web part that renders Excel workbooks on SharePoint page, the Excel Web Services provides access to its Web service. Moreover, the Excel Calculation Services is designed to load, calculate, and refresh data.
As I have mentioned in my previous blog, I will dedicate my entire month of August in sharing with you demonstration videos and contents on Windows SharePoint Services 3.0 and Microsoft Office SharePoint Server 2007.
This video is taken from the official site of Microsoft Office SharePoint Server 2007.