RSS and Atom are lightweight XML formats for sharing headlines and other Web content.
The heart of an RSS feed is an "item", which can have a title, link, and description.
Item from BBC News:
<item>
<title>Heat fuelling California wildfire</title>
<description>Firefighters tackling a wildfire north of Los Angeles say they are making
slow progress and the blaze remains very dangerous.</description>
<link>
http://news.bbc.co.uk/go/rss/-/1/hi/world/americas/8230540.stm
</link>
<guid isPermaLink="false">http://news.bbc.co.uk/1/hi/world/americas/8230540.stm
</guid>
<pubDate>Mon, 31 Aug 2009 20:19:25 GMT</pubDate>
<category>Americas</category>
<media:thumbnail width="66" height="49"
url="http://newsimg.bbc.co.uk/media/images/46297000/jpg/_46297386_007874482-1.jpg"/>
</item>