we do not have go to each and individual site, just rss of particular portion of the site can be pasted in rss reader and from rss reader we can have that much portion of the site in our rss reader. so we do not have to navigate the site.
RSS is an acronym for Really Simple Syndication and Rich Site Summary. RSS is an XML-based format for content distribution. Webmasters create an RSS file containing headlines and descriptions of specific information. While the majority of RSS feeds currently contain news headlines or breaking information the long term uses of RSS are broad.
Confusion between Web feed and RSS
The term "RSS" (Really Simple Syndication) is still sometimes used to refer to web feeds in general, including web feeds with a format different than RSS. For example, the Blogspace description of using web feeds in an aggregator is headlined "RSS info" and "RSS readers" even though its first sentence makes clear the inclusion of the Atom format: "RSS and Atom files provide news updates from a website in a simple form for your computer. "
The primary objective of all RSS modules is to extend the basic XML schema established for more robust syndication of content. This inherently allows for more diverse, yet standardized, transactions without modifying the core RSS specification.
To accomplish this extension, a tightly controlled vocabulary (in the RSS world, "module"; in the XML world, "schema") is declared through an XML namespace to give names to concepts and relationships between those concepts.