External content types are special content types connected to an external system, such as an SQL database and integrated with SharePoint sites. SharePoint Designer 2010 offers powerful configuration features for working with external content types, which we explore in Chapter 20.
One or more external lists may be associated with an external content type. Selecting the External Content Types tab provides access to existing external content types, as shown in Figure 7.47.
You can access the following tasks via the External Content Types tab.