In the last few years
the web became much more active than it used to be. Today we see an
explosion of new sources of information, such as news sites
appearing every day, and the latest trend on the web life - the
weblogs (every living person seems to have a web log these days).
As a natural reaction to this invasion of information, many systems
appeared that allow for grouping, filtering, and aggregating this
information. This is implemented in practice through web
syndication, which is that form of syndication where parts of a web
site (such as news, weblog posts, articles, and so on) are made
available for other sites or applications to use.
In order to be usable by other parties, the data to be shared must
be in a generic format that can be laid out in different formats
than in the original source, and when it comes to such formats, RSS
2.0 (Really Simple Syndication) and Atom are the most popular