You create a link between two data sets by selecting one or more attributes from one data set and associating them with corresponding attributes from another data set. These corresponding pairs of attributes are called a link key.
For each data set that is linked to others, Studio creates a linked view, which contains attributes from that data set, as well as those it is linked to. For more information, see About linked views.
While you cannot edit the linked views themselves, you can modify the data that appears in them by adding or removing link key attributes, changing the methods used to aggregate attributes within the view, and enabling or disabling automatic filtering.