Rich Site Summary (RSS) is a format for delivering regularly changing web content and is essentially an entire website, news broadcast, blog, or similar condensed down to bullet points. Each item consists of bare-bones information like the date and a descriptive title and is supplied with a hyperlink to the website page that contains the full article.
The data is extended from XML and must adhere to defined standards as described at http://www.rssboard.org/rss-specification.
Boiling it down to the basics for the purposes of this example, the XML looks as follows:
<rss> <channel> <title></title> <description></description> <link></link> <image> <url></url> <title></title> <link></link> <width></width> <height></height> </image> <item> ...