Portal pages are server rendered pages for your website visitors.
We have been exclusively working with the Desk which is the admin interface accessible by System Users. Usually you will want to give limited access to your customers. In our case, we want Library Members to be able to view available Articles that they can issue from our website. Portal Pages can help us achieve that.
Go to Article doctype, and scroll down to the Web View section.
We have now enabled web views for Article doctype. This means you can now view details of an Article on your website without logging into Desk. Let's test this out by creating a new Article. You should see See on Website at the top left of your form. Click on it to view the web view of the Article.