This is a demonstration store for Shopify.
You can try this Shopify theme for free by clicking here.
This page can either just contain your own text / images, or, like this page, also contain a contact form.
The choice is yours, just create your page, then choose page.contact from the page drop-down at the bottom of the page edit screen. In fact, you can choose to have the contact page at the bottom of any pages in your site, just choose the template page.contact!