Pages are an authering tool where you can create content and and link to educational resources in your course. You can write information or academic content and you can include images and videos and you can link to other resources in your course like other pages, assignments, files or external resources. It is possible to choose a Frontapage and make this the Home page of your course.
Pages can also be used as a collaboration tool where you can create class wikis and set specific user access for each page. Absalon keeps the entire history of a page so you can see the changes made to the page (and who did it).