RSS is a simple XML-based system that allows users to subscribe to their favorite websites. Using RSS, webmasters can put their content into a standardized format, which can be viewed and organized through RSS-aware software or automatically conveyed as new content on another website.
Programs known as feed readers or aggregators can check a list of feeds on behalf of a user and display any updated articles that they find. It is common to find web feeds on major websites and many smaller ones. Some websites let people choose between RSS or Atom formatted web feeds; others offer only RSS or only Atom.
RSS-aware programs are available for various operating systems. Client-side readers and aggregators are typically constructed as standalone programs or extensions to existing programs such as web browsers and Email readers. Many browsers have integrated support for RSS feeds. There also are other applications that can convert a RSS feed into several usenet articles, viewable through the major newsreader software such as Mozilla Thunderbird or Forté Agent: an example of such applications are nntp//rss, a Java coded program, or RSS Feed Converter a script for the popular mail-newsserver Hamster.
Web-based feed readers and news aggregators such as Newsgator, Bloglines, and Google Reader require no software installation and make the user's "feeds" available on any computer with Web access. Some aggregators combine existing web feeds into new feeds, e.g., taking all football related items from several sports feeds and providing a new football feed. There are also search engines for content published via web feeds like Feedster or Blogdigger.
On Web pages, web feeds (RSS or Atom) are typically linked with the word "Subscribe", an orange rectangle, a feed icon, or with the letters XML or RSS. Many news aggregators such as My Yahoo![1] publish subscription buttons for use on Web pages to simplify the process of adding news feeds.
