What is ROR?
ROR is a rapidly growing XML format for describing your website in a generic fashion, so that search engines can find and discover information more easily. By default ROR information is stored in a ROR file called ror.xml placed in your website's main directory.
ROR is a bit like a website business card. And that card can contain as much information as you want about your website (contact, address, feeds, articles, products, discounts, images, events, etc). You can even provide reviews of other websites.
You can also think of ROR as a master-feed with all your website data and metadata in it, organized in a tree-like structure. Shopping search engines focus on your product section, news search engines focus on your news feed section, etc, local search engines grab your contact section, and general search engines read everything including your sitemap section. And if you have a large website you can generate your ROR file from your website database on a regular basis.
To create your ROR file, use the ROR Generator.
To learn more about ROR, go to http://www.rorweb.com.