how does an xml feed work?

62vye

I would like to add property xml feeds to my website http://www.letsren2me.com

The feeds are from kyero.

I have contacted a web designer but wondered how it actually works before going ahead. I have a mysql database for all of my properties, would the xml properties use the database at all? I'm just wondering if they will blend in with the other properties which are in my db...or does the xml feed work in a different way?

When you click on one of the properties in the xml feed does it work in the same way as the other properties on the site?

I'm just wondering if the database will cope with adding 600 properties in one go. I know this sounds a bit of a strange question but I don't understand how it integrates with your website.