Pages are meant to hold the “static” content of your site. For example, the contact page, about page, etc… Pages are also the elements that will “host” the module displaying your news and events. Pages are essentially Posts without categories etc…
In Classic mode, editing pages is essentially like editing a page.
However, in Backend Editor (Visual Composer), the interface is quite different, allowing you to build complex designed pages. 
To know more about the Visual Composer mode, please read Content > Visual Composer.