Views are typically used to display an alternative to the main profile on cases. For example, a "Housing View" might have a different tab arrangement than the main profile to highlight information most important to those cases.
Views can be used in other modules. For example, a site using a dynamic home page can create alternative views for the home page.
Views are profile pages, and are built and maintained like other profile pages on the Admin > Processes, Forms, and Profiles page. See Process Management for details on building profile pages.
For an alternate view for cases, add a "New Profile View" (Actions menu > New Profile View) and make the Parent Profile the Main Profile.
For an alternate homepage, create a new profile layout view (older sites may need to first create a Master home page).
NB: Whether for cases or homepages, you should have one Master view. All your alternates should be created as profile views with the Master as the parent profile.
Setting Default Views by Roles and Preferences
The user preference and user role options shown below will only appear if there is at least one active view for each type of profile.
From a user's System Preferences page: