Ok, think about a website, for example, a sports club has.
They want a window shopping window, right? Where new members could be checking out if it is a cool club. An advertising part of the website, right?
But when these people become members in the club, the club want (on their website) to give these members more insights and information that they don’t want to share with the non-members (window shopping people).
So have the “window shopping” website now, but I also want to make a part of that site as a “member site”, i.e. in my existing website a part where members could log in and see other material, information, and pictures etc.
I hope that I explain good what I meant?