RSS is a family of web feed formats used to publish frequently updated digital content, such as blogs news feeds or podcasts. Consumers of RSS content use special browsers called aggregators to watch for new content in dozens or even hundreds of web feeds. The initials "RSS" are variously used to refer to the following standards:
- Really Simple Syndication (RSS 2.0)
- Rich Site Summary (RSS 0.91, RSS 1.0)
- RDF Site Summary (RSS 0.9 and 1.0)
RSS formats are specified in XML (a generic specification for data formats). RSS delivers its information as an XML file called an "RSS feed", "webfeed", "RSS stream", or "RSS channel".
On web Pages , web Feeds (RSS or Atom) are typically linked ith word "Subscribe",an orange rectangle 
, or with the letters 
or 
Many news aggregators publish subscription buttons for use on Web pages to simplify the process of adding news feeds.
HISTORY
Created by Netscape in 1999. First version is 0.90.
The 0.91 version has been improved by the Userland company in 2000.In 2000 the version 1.0 based on RDF is created and named RDF Site Summary, it comes from O'Reilly and is not related to other versions.RSS 2.0 was defined by Dave Winer (previously worker at Userland) at
Before RSS, several similar formats already existed for syndication, but none achieved widespread popularity or are still in common use today, as most were envisioned to work only with a single service. These originated from push and pull technologies. Two of the earliest examples are Backweb and Pointcast
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