Data sets are named logical groupings of related data objects. They are primarily used to organize data objects together visually, but you can also run a process on the data set.
While in the Data Canvas tree view, you can create a data set, or collection, of data objects by selecting the check box next to those objects you want to organize into a single data set. You can choose to display only user-defined data sets in the tree view, greatly simplifying the navigation of these objects.