When you activate a named view that has an associated section object, live sectioning is turned on for that section object. For a 3D model with multiple section objects, you might want to associate a particular section object to a view. Later, you can restore a saved sectional view and activate live sectioning for the associated section object.
For example, you can set up two section objects that cut through the 3D model in different directions. Section object A cuts the model along its width; Section object B cuts the model along its length. Perhaps you want to view the sectional cut that is perpendicular to your line of sight. By associating each section object with a view, you can quickly switch between the two views and see the desired cross section.
A camera is similar to a named view, with the exception of being able to manipulate the view seen through it using grip editing.