rss feed published xml data to the web

it can be any sort of information whatver the creator wants

you need a parser script and an address of the feed

the parser script will create html for the information in the feed

this is an example

http://www.axandra.com/news/rss.xml

it could be good for seo and marketing in general because it allows websites to publish your content dynamically , whihc means when you update your feed the content on all those site updates too