When you are editing a static page (or creating a new static page), you will see a dropdown of options for the "Page Type".
These are used to tell the system how the page should be handled (including how some functions and variables will be used).
(In this image, we can see that the Page Type is content)
These are the 3 pages types that you can use:
home - This type is used to mark this type of page as the homepage.
content - This will tell the system that this page will be a static page. content type pages can use images, call widgets and more.
profile_search_results - This are typically assigned to search results page, mostly related to members (eg: /california or /doctors/california, etc)
All other pages types will be deprecated soon.
Here you'll find a related topic that you could be interested in: