Arbitrary Pages are pages that do not have product on them. Examples are a 'Contact Us' page, 'Support', 'News', etc.
We also use them to put our css and js files on the server. That makes them easy to edit, and we don't have to FTP them to the server, which can be painful for frequently changing files.
Ignore the aws.html file. It's a playground file.
The source for the files above are attached to this page.