What is nddbc.html?

I got that page the other day and it's nasty. I hope none of my customers ever see it. It's in the root directory and has this bit in it:

<!--
<base href="http://localhost/" />
-->

<!--Make sure to change the above URL to the root address of your cart. Do not change the relative address to the index page, but you should change the address to your logo (a few lines below) to reflect your custom template directory (instead of template_default). Be sure to adjust the logo size to match yours. -->

What is the function of this page, and what do those few lines mean? What happens if I just delete that page?

nddbc = No Damn Data Base Connection

...and the instructions are inside the file:

Ya but I don't understand those instructions. That was the point of my post. Am I supposed to uncomment that base URL part and put my own URL there? I did that and it changed nothing. I also took out all the images and other junk in there and just left a line that says "problem connecting to database. Is that ok? Those instructions make it sound like you're not supposed to mess with the html, but I just don't see why that would be the case.

The idea is to have a presentable page for your users if your database is malfunctioning. You are welcome to change it however you'd like.

Thanks a lot for your help and quick responses!