Binding to a single object is quite straightforward. But life gets more interesting when you need to bind to some collection of objects—for example, all the products in a table.
Although every dependency property supports the single-value binding you've seen so far, collection binding requires an element with a bit more intelligence. In WPF, all the classes that derive from ItemsControl have the ability to show an entire list of items. Data binding possibilities include the ListBox, ComboBox, and ListView (and the Menu and TreeView for hierarchical data).